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We have the area of the rectangular prism=270 in^2
Consider the length =BD
Width=AB=15in
Now,Area=length*Width
270=15*BD
BD=18 inch
Now when the rectangle is rotated about the line connecting CF then the it will descibe a cylindrical surface whose base will have a radius =BD/2= 18/2 in=9 in
answer --option C
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20191115124755gerges Analysis Of Variance One Way Anova Start
The present study shows data for the weight lost by people who have been taking medications to treat overweight and obesit ...
20191115124755gerges Analysis Of Variance One Way Anova Start
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Montgomery College Requirements on Sampling Population Distribution Discussion
Experience 8 Critical Thinking Questions: What are the requirements on sampling and the population so that the distrib ...
Montgomery College Requirements on Sampling Population Distribution Discussion
Experience 8 Critical Thinking Questions: What are the requirements on sampling and the population so that the distribution of sample means is approximately normal? [2 bullets] How do you calculate the mean and standard deviation of the sampling distribution for sample means? [2 sentences] What is the effect of increasing sample size on the sampling distribution and what does this mean in terms of the central limit theorem? [2 sentences] Why is the standard deviation of the sampling distribution smaller than the standard deviation of the population from which it came? [3 sentences] Experience 9 Critical Thinking How do you find the margin of error from the lower and upper bounds of a confidence interval? [1 sentence] What is the effect of increasing the standard deviation on the margin of error? [2 sentences] Why does increasing the confidence level result in a larger margin of error? [2 sentences] Why would you be more likely to use a T-interval in a real-world situation than a Z-interval? [2 sentences] When do you use the t-distribution to determine the confidence interval for the mean? [3 sentences] Experience 9 Practice You measure 34 turtles' weights, and find they have a mean weight of 58 ounces. Assume the population standard deviation is 12.8 ounces. Based on this, construct a 99% confidence interval for the true population mean turtle weight. Give your answers as decimals, to two places ±± ounces Assume that a sample is used to estimate a population mean μ. Find the margin of error M.E. that corresponds to a sample of size 15 with a mean of 33.2 and a standard deviation of 8.6 at a confidence level of 99%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 78.2 for a sample of size 455 and standard deviation 9.8. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99% confidence level). Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). < μ < Answer should be obtained without any preliminary rounding. You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures: 39.2 11.8 24.4 33.6 22.4 46.9 38.6 42.5 Find the 95% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). 95% C.I. = SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? Make sure to give a whole number answer. Experience 9 Application A generic drug is being tested to test its efficacy (effectiveness) at reducing blood pressure in patients with hypertension (a.k.a. high blood pressure). In a randomized, double-blind experiment with 200 patients, 100 are given the name-brand drug (control group) and 100 are given a generic version of the drug (treatment group). In the control group, the average reduction in blood pressure is 15.2 mmHG with a standard deviation of 11.5 mmHG. In the treatment group, there is an average reduction of 14.6 mmHG and a standard deviation of 12.5 mmHG. Neither group has any outliers. A researcher claims that this study shows the generic drug is not as effective as the name-brand drug. What would be the reply of a statistician? You have two attempts for this problem so choose wisely. If you do not receive 5 points in the Gradebook after submitting this assignment then you have answered incorrectly. Make sure to try it again before the deadline. The standard deviations are quite large within each group relative to the size of the difference in point estimates. It is unclear if there is a real difference in the effectiveness of the two drugs or if the difference is just due to chance.While there is some uncertainty in the point estimates, the sample sizes for each group are large, indicating that the difference must be real.Because the difference in sample means is under 1 mmHG, we can safely conclude the drugs are equally effective.The point estimate for the generic drug is lower than that of the name-brand drug, which means the generic drug is less effective. The researcher is correct. Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 10 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: 3 2.3 2.6 2.8 2.4 2.5 2.2 2.8 2.3 2.7 a. What is a point estimate for the population mean length of time. (Round answer to 4 decimal places) b. Which distribution should you use for this problem? t-distributionnormal distribution c. Why? d. What must be true in order to construct a confidence interval in this situation? The population must be approximately normalThe population standard deviation must be knownThe sample size must be greater than 30The population mean must be known e. Construct a 80% confidence interval for the population mean length of time. Enter your answer as an open-interval (i.e., parentheses) Round upper and lower bounds to two decimal places f. Interpret the confidence interval in a complete sentence. Make sure you include units g. What does it mean to be "80% confident" in this problem? Use the definition of confidence level. There is a 80% chance that the confidence interval contains the population meanThe confidence interval contains 80% of all samples80% of all simple random samples of size 10 from this population will result in confidence intervals that contain the population mean h. Suppose that the company releases a statement that the mean time for all patients is 2 hours. Is this possible? NoYes Is it likely? YesNo i. Use the results above and make an argument in favor or against the company's statement. Structure your essay as follows: Describe the population and parameter for this situation. Describe the sample and statistic for this situation. Give a brief explanation of what a confidence interval is. Explain what type of confidence interval you can make in this situation and why. Interpret the confidence interval for this situation. Restate the company's claim and whether you agree with it or not. Use the confidence interval to estimate the likelihood of the company's claim being true. Suggest what the company should do.
ELAC Global Supply Chains Problem Set Inventory Aggregation Excel Worksheet
You will watch the course recording to do the assignment, and please submit it by Excel file.https://bu-metcollege.zoom.us ...
ELAC Global Supply Chains Problem Set Inventory Aggregation Excel Worksheet
You will watch the course recording to do the assignment, and please submit it by Excel file.https://bu-metcollege.zoom.us/rec/play/E5J-xTkDoZ2...Global Supply Chains
Problem Set: Inventory Aggregation
Your friend Jane, an entrepreneur living in Boston, needs your help. Jane is considering opening an online store
to sell a product that will have a logo of one of the top universities in Boston. She is very secretive at this point
and will not tell you the type of product – just that it comes in five colors and will contain one of the 8 logos (i.e.,
there are 40 different configurations of the product). She asked another friend to make demand forecasts. The
forecast indicates level demand over the year, with the average weekly demand and the standard deviation of
the weekly demand forecast shown in Table 1. Demand will be independent across products but demand will
be positively correlated over time.
Table 1: Demand Forecast
Jane has also contracted with an offshore manufacturing facility to produce the products. Their lead-time
agreement specifies that ordered products will be received 12 weeks after the order is placed. Jane will place
orders on a weekly basis (once per week). Jane has the option of printing the logo herself (after a customer
places an order) or having the offshore supplier print the logo. She estimates her average printing cost to be
$0.75 per unit. Unfortunately, because the supplier’s manufacturing processes are typically setup to include
printing, there will be no decrease in supplier production costs if Jane prints the logos. The offshore production
costs per unit are shown in Table 2.
Offshore Poduction Costs
Table 2: Production Costs
Jane needs help with inventory planning. In particular, she has two options in mind. The first option will consist
of holding final product inventory for all 40 of the product configurations. She likes this option because she
would be able to immediately ship products to customers. The second option would consist of holding inventory
of the five product colors, and printing the university logos herself before shipment to customers. She likes this
option because it simplifies inventory requirements.
For this assignment, create an Excel spreadsheet to evaluate the two options. The comparison should compare:
(a) the annual holding cost of safety stock for the “no aggregation” option, where all 40 final product
configurations are held in inventory, and (b) the annual holding cost of safety stock plus the increased printing
cost for the “aggregation” option, where inventory is held by color so that only 5 different items are held in
inventory. When analyzing the two alternatives, use a target product fill rate of 99%.
After explaining inventory holding costs to Jane, you agree to use an annual holding rate of 35% for your
analysis because jane will need to rent warehouse space. However, this value is uncertain. So, you agree to use
a graphical display to show her how the options compare if the annual holding rate is changed over a range from
15% to 50%.
The assessment of this work will be based on the accuracy and clarity of your spreadsheet and the graph.
Submit one Excel file, using a file name Lastname_PS2.
4 pages
201909080132202019090717420220190905214223cf Daa Template 4 Anova Test .edited 1
Farhadi et al. (2015), illustrate the possibility of using an ANOVA test to assess the significance of the differential im ...
201909080132202019090717420220190905214223cf Daa Template 4 Anova Test .edited 1
Farhadi et al. (2015), illustrate the possibility of using an ANOVA test to assess the significance of the differential impact of demographic ...
GMU Week 1 Level of Measurement for The Variable Annual Income Questions
his assignment is based on the Patients' Use of the Internet for Medical Information article that you read. After you have ...
GMU Week 1 Level of Measurement for The Variable Annual Income Questions
his assignment is based on the Patients' Use of the Internet for Medical Information article that you read. After you have read the article, you are to answer the following questions in a word document. This week’s article researched a question around Internet use by patients for obtaining health-related information. Using postal-mail delivered surveys mailed to a random sample of 1,000 patients at a practice in 2002, the research would be considered out-of-context today, for sure. However, in 2002, the idea of using the Internet for health information was still relatively new, and its use was increasing rapidly.Consider Table 1 in the article.What level-of-measurement is the variable Annual Income? Explain your choice.Generally (not statistically) characterize how you see Education level and Income as influencing the use of the Internet for health information in this sample.The standard deviation of age is provided for both groups of respondents. Which group has the greater variability? What does this mean in layman’s terms?Why does the standard deviation have a more easily understood meaning than the variance to describe variability?In the study, the authors use an odds ratio to describe the relationship between several variables. Using a source of your choosing, research the meaning of an odds ratio and apply your understanding of it to the relationship between education level and income level to the use of the Internet for health information – that is, interpret the meaning of the authors’ results. The odds ratio values for each relationship are provided in the research.We characterize statistics as inferential or descriptive. How would you characterize the statistics used in this research article – discuss your response.Provide an example from the article where the authors use an ordinal level of measurement Justify your selection.
7 questions, The prices in dollars for a particular model of camera are shown below for 10 online retailers, statistics homework help
8. The prices in dollars for a particular model of camera are shown below for 10 online retailers. Estimate the true mean ...
7 questions, The prices in dollars for a particular model of camera are shown below for 10 online retailers, statistics homework help
8. The prices in dollars for a particular model of camera are shown below for 10 online retailers. Estimate the true mean price for this particular camera with 95% confidence. Assume normal distribution. 225, 240, 215, 206, 211, 210, 193, 250, 225, 202. Please round to the nearest tenth and write your answer in the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.9. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size. n = 23, the standard deviation is unknown, the population appears to be normally distributedo T-Distributiono Normal Distributiono neither of the methods studied by us can be used10. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size.n = 200, the standard deviation is 15, the population appears to be skewedT-DistributionNormal Distributionneither of the methods studied by us can be used11. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size.n = 5, the standard deviation is known, the population appears to be very skewed neither of the methods studied by us can be used Normal Distribution t-distribution12. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size n = 200, the standard deviation is unknown, the population appears to be normally distributed T-Distribution Normal Distribution13. A university of dean of students wishes to estimate the average number of hours students spend doing homework per week. The standard deviation from a previous study is 6.2 hours. How large a sample must be selected if he wants to be 99% confident of finding whether the true mean differs from the sample mean by 1.5 hours?14. If the variance of a national accounting examination is 900, how large a sample is needed to estimate the true mean score within 5 points with 99% confidence?
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Most Popular Content
11 pages
20191115124755gerges Analysis Of Variance One Way Anova Start
The present study shows data for the weight lost by people who have been taking medications to treat overweight and obesit ...
20191115124755gerges Analysis Of Variance One Way Anova Start
The present study shows data for the weight lost by people who have been taking medications to treat overweight and obesity
Montgomery College Requirements on Sampling Population Distribution Discussion
Experience 8 Critical Thinking Questions: What are the requirements on sampling and the population so that the distrib ...
Montgomery College Requirements on Sampling Population Distribution Discussion
Experience 8 Critical Thinking Questions: What are the requirements on sampling and the population so that the distribution of sample means is approximately normal? [2 bullets] How do you calculate the mean and standard deviation of the sampling distribution for sample means? [2 sentences] What is the effect of increasing sample size on the sampling distribution and what does this mean in terms of the central limit theorem? [2 sentences] Why is the standard deviation of the sampling distribution smaller than the standard deviation of the population from which it came? [3 sentences] Experience 9 Critical Thinking How do you find the margin of error from the lower and upper bounds of a confidence interval? [1 sentence] What is the effect of increasing the standard deviation on the margin of error? [2 sentences] Why does increasing the confidence level result in a larger margin of error? [2 sentences] Why would you be more likely to use a T-interval in a real-world situation than a Z-interval? [2 sentences] When do you use the t-distribution to determine the confidence interval for the mean? [3 sentences] Experience 9 Practice You measure 34 turtles' weights, and find they have a mean weight of 58 ounces. Assume the population standard deviation is 12.8 ounces. Based on this, construct a 99% confidence interval for the true population mean turtle weight. Give your answers as decimals, to two places ±± ounces Assume that a sample is used to estimate a population mean μ. Find the margin of error M.E. that corresponds to a sample of size 15 with a mean of 33.2 and a standard deviation of 8.6 at a confidence level of 99%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 78.2 for a sample of size 455 and standard deviation 9.8. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99% confidence level). Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). < μ < Answer should be obtained without any preliminary rounding. You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures: 39.2 11.8 24.4 33.6 22.4 46.9 38.6 42.5 Find the 95% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). 95% C.I. = SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? Make sure to give a whole number answer. Experience 9 Application A generic drug is being tested to test its efficacy (effectiveness) at reducing blood pressure in patients with hypertension (a.k.a. high blood pressure). In a randomized, double-blind experiment with 200 patients, 100 are given the name-brand drug (control group) and 100 are given a generic version of the drug (treatment group). In the control group, the average reduction in blood pressure is 15.2 mmHG with a standard deviation of 11.5 mmHG. In the treatment group, there is an average reduction of 14.6 mmHG and a standard deviation of 12.5 mmHG. Neither group has any outliers. A researcher claims that this study shows the generic drug is not as effective as the name-brand drug. What would be the reply of a statistician? You have two attempts for this problem so choose wisely. If you do not receive 5 points in the Gradebook after submitting this assignment then you have answered incorrectly. Make sure to try it again before the deadline. The standard deviations are quite large within each group relative to the size of the difference in point estimates. It is unclear if there is a real difference in the effectiveness of the two drugs or if the difference is just due to chance.While there is some uncertainty in the point estimates, the sample sizes for each group are large, indicating that the difference must be real.Because the difference in sample means is under 1 mmHG, we can safely conclude the drugs are equally effective.The point estimate for the generic drug is lower than that of the name-brand drug, which means the generic drug is less effective. The researcher is correct. Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 10 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: 3 2.3 2.6 2.8 2.4 2.5 2.2 2.8 2.3 2.7 a. What is a point estimate for the population mean length of time. (Round answer to 4 decimal places) b. Which distribution should you use for this problem? t-distributionnormal distribution c. Why? d. What must be true in order to construct a confidence interval in this situation? The population must be approximately normalThe population standard deviation must be knownThe sample size must be greater than 30The population mean must be known e. Construct a 80% confidence interval for the population mean length of time. Enter your answer as an open-interval (i.e., parentheses) Round upper and lower bounds to two decimal places f. Interpret the confidence interval in a complete sentence. Make sure you include units g. What does it mean to be "80% confident" in this problem? Use the definition of confidence level. There is a 80% chance that the confidence interval contains the population meanThe confidence interval contains 80% of all samples80% of all simple random samples of size 10 from this population will result in confidence intervals that contain the population mean h. Suppose that the company releases a statement that the mean time for all patients is 2 hours. Is this possible? NoYes Is it likely? YesNo i. Use the results above and make an argument in favor or against the company's statement. Structure your essay as follows: Describe the population and parameter for this situation. Describe the sample and statistic for this situation. Give a brief explanation of what a confidence interval is. Explain what type of confidence interval you can make in this situation and why. Interpret the confidence interval for this situation. Restate the company's claim and whether you agree with it or not. Use the confidence interval to estimate the likelihood of the company's claim being true. Suggest what the company should do.
ELAC Global Supply Chains Problem Set Inventory Aggregation Excel Worksheet
You will watch the course recording to do the assignment, and please submit it by Excel file.https://bu-metcollege.zoom.us ...
ELAC Global Supply Chains Problem Set Inventory Aggregation Excel Worksheet
You will watch the course recording to do the assignment, and please submit it by Excel file.https://bu-metcollege.zoom.us/rec/play/E5J-xTkDoZ2...Global Supply Chains
Problem Set: Inventory Aggregation
Your friend Jane, an entrepreneur living in Boston, needs your help. Jane is considering opening an online store
to sell a product that will have a logo of one of the top universities in Boston. She is very secretive at this point
and will not tell you the type of product – just that it comes in five colors and will contain one of the 8 logos (i.e.,
there are 40 different configurations of the product). She asked another friend to make demand forecasts. The
forecast indicates level demand over the year, with the average weekly demand and the standard deviation of
the weekly demand forecast shown in Table 1. Demand will be independent across products but demand will
be positively correlated over time.
Table 1: Demand Forecast
Jane has also contracted with an offshore manufacturing facility to produce the products. Their lead-time
agreement specifies that ordered products will be received 12 weeks after the order is placed. Jane will place
orders on a weekly basis (once per week). Jane has the option of printing the logo herself (after a customer
places an order) or having the offshore supplier print the logo. She estimates her average printing cost to be
$0.75 per unit. Unfortunately, because the supplier’s manufacturing processes are typically setup to include
printing, there will be no decrease in supplier production costs if Jane prints the logos. The offshore production
costs per unit are shown in Table 2.
Offshore Poduction Costs
Table 2: Production Costs
Jane needs help with inventory planning. In particular, she has two options in mind. The first option will consist
of holding final product inventory for all 40 of the product configurations. She likes this option because she
would be able to immediately ship products to customers. The second option would consist of holding inventory
of the five product colors, and printing the university logos herself before shipment to customers. She likes this
option because it simplifies inventory requirements.
For this assignment, create an Excel spreadsheet to evaluate the two options. The comparison should compare:
(a) the annual holding cost of safety stock for the “no aggregation” option, where all 40 final product
configurations are held in inventory, and (b) the annual holding cost of safety stock plus the increased printing
cost for the “aggregation” option, where inventory is held by color so that only 5 different items are held in
inventory. When analyzing the two alternatives, use a target product fill rate of 99%.
After explaining inventory holding costs to Jane, you agree to use an annual holding rate of 35% for your
analysis because jane will need to rent warehouse space. However, this value is uncertain. So, you agree to use
a graphical display to show her how the options compare if the annual holding rate is changed over a range from
15% to 50%.
The assessment of this work will be based on the accuracy and clarity of your spreadsheet and the graph.
Submit one Excel file, using a file name Lastname_PS2.
4 pages
201909080132202019090717420220190905214223cf Daa Template 4 Anova Test .edited 1
Farhadi et al. (2015), illustrate the possibility of using an ANOVA test to assess the significance of the differential im ...
201909080132202019090717420220190905214223cf Daa Template 4 Anova Test .edited 1
Farhadi et al. (2015), illustrate the possibility of using an ANOVA test to assess the significance of the differential impact of demographic ...
GMU Week 1 Level of Measurement for The Variable Annual Income Questions
his assignment is based on the Patients' Use of the Internet for Medical Information article that you read. After you have ...
GMU Week 1 Level of Measurement for The Variable Annual Income Questions
his assignment is based on the Patients' Use of the Internet for Medical Information article that you read. After you have read the article, you are to answer the following questions in a word document. This week’s article researched a question around Internet use by patients for obtaining health-related information. Using postal-mail delivered surveys mailed to a random sample of 1,000 patients at a practice in 2002, the research would be considered out-of-context today, for sure. However, in 2002, the idea of using the Internet for health information was still relatively new, and its use was increasing rapidly.Consider Table 1 in the article.What level-of-measurement is the variable Annual Income? Explain your choice.Generally (not statistically) characterize how you see Education level and Income as influencing the use of the Internet for health information in this sample.The standard deviation of age is provided for both groups of respondents. Which group has the greater variability? What does this mean in layman’s terms?Why does the standard deviation have a more easily understood meaning than the variance to describe variability?In the study, the authors use an odds ratio to describe the relationship between several variables. Using a source of your choosing, research the meaning of an odds ratio and apply your understanding of it to the relationship between education level and income level to the use of the Internet for health information – that is, interpret the meaning of the authors’ results. The odds ratio values for each relationship are provided in the research.We characterize statistics as inferential or descriptive. How would you characterize the statistics used in this research article – discuss your response.Provide an example from the article where the authors use an ordinal level of measurement Justify your selection.
7 questions, The prices in dollars for a particular model of camera are shown below for 10 online retailers, statistics homework help
8. The prices in dollars for a particular model of camera are shown below for 10 online retailers. Estimate the true mean ...
7 questions, The prices in dollars for a particular model of camera are shown below for 10 online retailers, statistics homework help
8. The prices in dollars for a particular model of camera are shown below for 10 online retailers. Estimate the true mean price for this particular camera with 95% confidence. Assume normal distribution. 225, 240, 215, 206, 211, 210, 193, 250, 225, 202. Please round to the nearest tenth and write your answer in the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.9. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size. n = 23, the standard deviation is unknown, the population appears to be normally distributedo T-Distributiono Normal Distributiono neither of the methods studied by us can be used10. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size.n = 200, the standard deviation is 15, the population appears to be skewedT-DistributionNormal Distributionneither of the methods studied by us can be used11. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size.n = 5, the standard deviation is known, the population appears to be very skewed neither of the methods studied by us can be used Normal Distribution t-distribution12. Assume that we want to construct a confidence interval. Determine whether you should use the t-distribution or the normal distribution to find it, based off of the following information. In this problem, let n be the sample size n = 200, the standard deviation is unknown, the population appears to be normally distributed T-Distribution Normal Distribution13. A university of dean of students wishes to estimate the average number of hours students spend doing homework per week. The standard deviation from a previous study is 6.2 hours. How large a sample must be selected if he wants to be 99% confident of finding whether the true mean differs from the sample mean by 1.5 hours?14. If the variance of a national accounting examination is 900, how large a sample is needed to estimate the true mean score within 5 points with 99% confidence?
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