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Assignment understanding and exploring assumptions
You will submit one Word document for this assignment. You will create this Word document by cutting and pasting SPSS outp ...
Assignment understanding and exploring assumptions
You will submit one Word document for this assignment. You will create this Word document by cutting and pasting SPSS output into Word. Name the file in the following format: lastnamefirstinitialPSY7107-6.doc (example: smithbPSY7107-6.doc).Begin by downloading the following SPSS data sets:DownloadFestival.savSPSSExam.savChickFlick.savWhy do we care whether the assumptions required for statistical tests are met? (You might also want to write your answer on a note card you paste to your computer.)Open the data set that you corrected in a previous assignment for DownloadFestival.sav. You will use the following variables: Day1, Day2, and Day3 (hygiene variable for all three days). Create a simple histogram for each variable. Choose to display the normal curve (under Element Properties) and title your charts. Copy these plots into your assignment Word document.Now create probability-probability (p-p) plots for each variable. This output will give you additional information. Read over the Case Processing Summary. Notice that there is missing data for Days 2 and Day 3. Copy only the Normal p-p Plots into your assignment Word document (you do not need to copy the beginning output nor the Detrended Normal p-p Plots).Examining the histograms and p-p plots describe the dataset, with particular attention toward the assumption of normality. For each day, do you think the responses are reasonably normally distributed? (Just give your impression of the data.) Why or why not?Using the same dataset, and the Frequency command, calculate the standard descriptive measures (mean, median, mode, standard deviation, variance and range) as well as kurtosis and skew for all three hygiene variables. Paste your output into your assignment Word document (you do not need to paste the Frequency Table). What does the output tell you? You will need to comment on: sample size, measures of central tendency and dispersion and well as kurtosis and skewness. You will need to either calculate z scores for skewness and kurtosis or use those given in the book to provide a complete answer. Bottom line: is the assumption of normality met for these three variables? Does this match your visual observations from question #2?Using the dataset SPSSExam.sav, and the Frequency command, calculate: the standard descriptive statistics (mean, median, mode, standard deviation, variance and range) plus skew and kurtosis, and histograms with the normal curve on the following variables: Computer, Exam, Lecture, and Numeracy for the entire dataset. Complete the same analysis using University as a grouping variable. Paste your output into your assignment Word document (you do not need to paste the Frequency Table). What do the results tell you with regard to whether the data are normally distributed?Using the dataset SPSSExam.sav, determine whether the scores on computer literacy and percentage of lectures attended (with University as a grouping variable) meet the assumption of homogeneity of variance (use Levene’s test). You must remember to unclick the “split file” option used above before doing this test. What does the output tell you? (Be as specific as possible.)Describe the assumptions of normality and homogeneity of variance. When these assumptions are violated, what are your options? Are there cases in which the assumptions may technically be violated, yet have no impact on your intended analyses? Explain.
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.
UNLV Linear Programs and Graphical Approach on Lp Problem Equations Math Questions
Can you help me do these 5 questions of math for me?You can only insert answers next to the equations.You do not have to w ...
UNLV Linear Programs and Graphical Approach on Lp Problem Equations Math Questions
Can you help me do these 5 questions of math for me?You can only insert answers next to the equations.You do not have to write the processes how you solved them
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Assignment understanding and exploring assumptions
You will submit one Word document for this assignment. You will create this Word document by cutting and pasting SPSS outp ...
Assignment understanding and exploring assumptions
You will submit one Word document for this assignment. You will create this Word document by cutting and pasting SPSS output into Word. Name the file in the following format: lastnamefirstinitialPSY7107-6.doc (example: smithbPSY7107-6.doc).Begin by downloading the following SPSS data sets:DownloadFestival.savSPSSExam.savChickFlick.savWhy do we care whether the assumptions required for statistical tests are met? (You might also want to write your answer on a note card you paste to your computer.)Open the data set that you corrected in a previous assignment for DownloadFestival.sav. You will use the following variables: Day1, Day2, and Day3 (hygiene variable for all three days). Create a simple histogram for each variable. Choose to display the normal curve (under Element Properties) and title your charts. Copy these plots into your assignment Word document.Now create probability-probability (p-p) plots for each variable. This output will give you additional information. Read over the Case Processing Summary. Notice that there is missing data for Days 2 and Day 3. Copy only the Normal p-p Plots into your assignment Word document (you do not need to copy the beginning output nor the Detrended Normal p-p Plots).Examining the histograms and p-p plots describe the dataset, with particular attention toward the assumption of normality. For each day, do you think the responses are reasonably normally distributed? (Just give your impression of the data.) Why or why not?Using the same dataset, and the Frequency command, calculate the standard descriptive measures (mean, median, mode, standard deviation, variance and range) as well as kurtosis and skew for all three hygiene variables. Paste your output into your assignment Word document (you do not need to paste the Frequency Table). What does the output tell you? You will need to comment on: sample size, measures of central tendency and dispersion and well as kurtosis and skewness. You will need to either calculate z scores for skewness and kurtosis or use those given in the book to provide a complete answer. Bottom line: is the assumption of normality met for these three variables? Does this match your visual observations from question #2?Using the dataset SPSSExam.sav, and the Frequency command, calculate: the standard descriptive statistics (mean, median, mode, standard deviation, variance and range) plus skew and kurtosis, and histograms with the normal curve on the following variables: Computer, Exam, Lecture, and Numeracy for the entire dataset. Complete the same analysis using University as a grouping variable. Paste your output into your assignment Word document (you do not need to paste the Frequency Table). What do the results tell you with regard to whether the data are normally distributed?Using the dataset SPSSExam.sav, determine whether the scores on computer literacy and percentage of lectures attended (with University as a grouping variable) meet the assumption of homogeneity of variance (use Levene’s test). You must remember to unclick the “split file” option used above before doing this test. What does the output tell you? (Be as specific as possible.)Describe the assumptions of normality and homogeneity of variance. When these assumptions are violated, what are your options? Are there cases in which the assumptions may technically be violated, yet have no impact on your intended analyses? Explain.
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.
UNLV Linear Programs and Graphical Approach on Lp Problem Equations Math Questions
Can you help me do these 5 questions of math for me?You can only insert answers next to the equations.You do not have to w ...
UNLV Linear Programs and Graphical Approach on Lp Problem Equations Math Questions
Can you help me do these 5 questions of math for me?You can only insert answers next to the equations.You do not have to write the processes how you solved them
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