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H0: mu1 = mu2
Ha: mu1 ≠ mu2
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15 questions regarding Sampling, hypothesis testing, and regression
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms ...
15 questions regarding Sampling, hypothesis testing, and regression
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms where possible.Answer the following problems showing your work and explaining (or analyzing) your results. Submit your work in a typed Microsoft Word document.
Choose one design method from the list below. Using your example, make a list of 2 or 3 advantages and 2 or 3 disadvantages for using the method. (2 pts)
Simple random sampling
Systematic sampling
Stratified sampling
Cluster sampling
The name of each student in a class is written on a separate card. The cards are placed in a bag. Three names are picked from the bag. Identify which type of sampling is used and why. (2 pts)
A phone company obtains an alphabetical list of names of homeowners in a city. They select every 25th person from the list until a sample of 100 is obtained. They then call these 100 people to advertise their services. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)
The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects 10 schools from the district and interviews all of the teachers at the selected schools. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)
Fifty-one sophomore, 42 junior, and 55 senior students are selected from classes with 516, 428, and 551 students respectively. Identify which type of sampling is used and explain your reasoning. (2 pts)
You want to investigate the workplace attitudes concerning new policies that were put into effect. You have funding and support to contact at most 100 people. Choose a design method and discuss the following:
Describe the sample design method you will use and why. (2 pts)
Specify the population and sample group. Will you include everyone who works for the company, certain departments, full or part-time employees, etc.? (2 pts)
Discuss the bias, on the part of both the researcher and participants. (2 pts)
A local newspaper wanted to gather information about house sales in the area. It distributed 25,000 electronic surveys to its readers asking questions about house sales in the past 6 months. Of the surveys sent out, 3.2% were returned. The results found that 92% of people did not sell their house in the past 6 months and 85% of people would expect a loss if they sold their house. The writer wants to use these results to conclude that the housing market is declining, and we are headed for a recession.
Explain the bias and sampling error in this study. (2 pts)
Should the writer conclude that the housing market is declining based upon this data? (2 pts)
Why or why not? (2 pts)
A homeowner is getting carpet installed. The installer is charging her for 250 square feet. She thinks this is more than the actual space being carpeted. She asks a second installer to measure the space to confirm her doubt. Write the null hypothesis Ho and the alternative hypothesis Ha. (2 pts)
Drug A is the usual treatment for depression in graduate students. Pfizer has a new drug, Drug B, that it thinks may be more effective. You have been hired to design the test program. As part of your project briefing, you decide to explain the logic of statistical testing to the people who are going to be working for you.
Write the research hypothesis and the null hypothesis. (2 pts)
Then construct a table like the one below, displaying the outcomes that would constitute Type I and Type II error. (2 pts)
Write a paragraph explaining which error would be more severe, and why. (2 pts)
Cough-a-Lot children’s cough syrup is supposed to contain 6 ounces of medicine per bottle. However, since the filling machine is not always precise, there can be variation from bottle to bottle. The amounts in the bottles are normally distributed with σ = 0.3 ounces. A quality assurance inspector measures 10 bottles and finds the following (in ounces):
5.95
6.10
5.98
6.01
6.25
5.85
5.91
6.05
5.88
5.91
Are the results enough evidence to conclude that the bottles are not filled adequately at the labeled amount of 6 ounces per bottle?
State the hypothesis you will test. (2 pts)
Calculate the test statistic. (2 pts)
Find the P-value. (2 pts)
What is the conclusion? (2 pts)
Calculate a Z score when X = 20, μ = 17, and σ = 3.4. (2 pts)
Using a standard normal probabilities table, interpret the results for the Z score in Problem 12. (2 pts)
Your babysitter claims that she is underpaid given the current market. Her hourly wage is $12 per hour. You do some research and discover that the average wage in your area is $14 per hour with a standard deviation of 1.9. Calculate the Z score and use the table to find the standard normal probability. Based on your findings, should you give her a raise? Explain your reasoning as to why or why not. (2 pts)
Tutor O-Rama claims that their services will raise student SAT math scores at least 50 points. The average score on the math portion of the SAT is μ=350 and σ=35. The 100 students who completed the tutoring program had an average score of 385 points.
Is the students’ average score of 385 points significant at the 5% and 1% levels to support Tutor O-Rama’s claim of at least a 50-point increase in the SAT score? (2 pts)
Is the Tutor O-Rama students’ average score of 385 points significantly different at the 5% and 1% levels from the average score of 350 points on the math portion of the SAT? What conclusion can you make, based on your results, about the effectiveness of Tutor O-Rama’s tutoring? (2 pts)
RES 710 UP Measures of Central Tendency & Normal Distribution Discussion
1. when distributions are skewed a researcher will eliminate some of the data to allow for a more normal distribution. How ...
RES 710 UP Measures of Central Tendency & Normal Distribution Discussion
1. when distributions are skewed a researcher will eliminate some of the data to allow for a more normal distribution. However, there are many problems with doing this, the most obvious being that you are no longer analyze the population you started out with. What are some other problems you can see with doing this? Is there ever an appropriate time to delete some data causing a skewed distribution?
2. How will you use measures of central tendency in your dissertation research or professional practice?
Saudi Electronic University Basic Concepts of Probability Presentation
I want a presentation with one of the chapters in the book that it containsI need to summarize this chapterTerms: 1- Intro ...
Saudi Electronic University Basic Concepts of Probability Presentation
I want a presentation with one of the chapters in the book that it containsI need to summarize this chapterTerms: 1- Introduction of the summary2- paraphrasing using your own words3- Summary should be 11 pages at least 4- I need 3-4 exercises to be included in the summary - Solved ones are ok to use-
Observational Study Analytical Review
You need to post 1 unique article/explanation about an experiment OR 1 unique article/explanation about an observational s ...
Observational Study Analytical Review
You need to post 1 unique article/explanation about an experiment OR 1 unique article/explanation about an observational study. You should begin a new thread with your topic, and include:1.) A link to the website or upload the relevant file.2.) The requested explanation or calculation 3.) Format your post like this: “Observational Study: In this article, Gallup polled 200 people about ....” so that it is clear to everyone which topic you have chosen.4.) Use “Observational Study” or “Experiment” in the title (no quotation marks necessary). Here are the details on the articles and discussion you should post to a new thread (choose only ONE):1.) Observational Study:a.How was the sample collected? (Use appropriate statistics terminology: Simple Random Sample, Stratified Random Sample, Cluster Sample, Voluntary Response)b. What is the sample size?c.What was the response rate?d.What variables were measured?e.Were the results displayed in a graph? If so, what type of graph was used? If not, what type of graph would be appropriate for displaying this data?f.What are potential sources of bias? g.What could be done to improve this study?2.) Experiment:a.Who or what is in the sample? What is the sample size?b. What is/are the treatments?c.What is the design of the experiment? Is it one we learned in class?d. Were the three principles of good experimental design (Randomization, Replication, Comparison/Control) used?e. What are the response variables? Are these variables categorical or quantitative? f.Were the results shown with a graph? If so, what kind of graph was used? If not, what kind of graph would be appropriate for displaying this data?g.What are some potential lurking variables? Explain your reasoning.
Null hypothesis and alternative hypothesis
Blood glucose levelsfor obese patients have a mean of 98 mg/dl with a standard deviation of 14.2 mg/dl. A resear ...
Null hypothesis and alternative hypothesis
Blood glucose levelsfor obese patients have a mean of 98 mg/dl with a standard deviation of 14.2 mg/dl. A researcher thinks that a diet high in raw cornstarch will have a positive effect on blood glucose levels. A sample of 28 patients who have tried the raw cornstarch diet have a mean glucose level of 103.4 mg/dl.
Conduct
the test that the raw cornstarch die had an effect at the 0.05 significance
level. Be sure to show all steps.
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Most Popular Content
15 questions regarding Sampling, hypothesis testing, and regression
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms ...
15 questions regarding Sampling, hypothesis testing, and regression
Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms where possible.Answer the following problems showing your work and explaining (or analyzing) your results. Submit your work in a typed Microsoft Word document.
Choose one design method from the list below. Using your example, make a list of 2 or 3 advantages and 2 or 3 disadvantages for using the method. (2 pts)
Simple random sampling
Systematic sampling
Stratified sampling
Cluster sampling
The name of each student in a class is written on a separate card. The cards are placed in a bag. Three names are picked from the bag. Identify which type of sampling is used and why. (2 pts)
A phone company obtains an alphabetical list of names of homeowners in a city. They select every 25th person from the list until a sample of 100 is obtained. They then call these 100 people to advertise their services. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)
The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects 10 schools from the district and interviews all of the teachers at the selected schools. Does this sampling plan result in a random sample? What type of sample is it? Explain. (2 pts)
Fifty-one sophomore, 42 junior, and 55 senior students are selected from classes with 516, 428, and 551 students respectively. Identify which type of sampling is used and explain your reasoning. (2 pts)
You want to investigate the workplace attitudes concerning new policies that were put into effect. You have funding and support to contact at most 100 people. Choose a design method and discuss the following:
Describe the sample design method you will use and why. (2 pts)
Specify the population and sample group. Will you include everyone who works for the company, certain departments, full or part-time employees, etc.? (2 pts)
Discuss the bias, on the part of both the researcher and participants. (2 pts)
A local newspaper wanted to gather information about house sales in the area. It distributed 25,000 electronic surveys to its readers asking questions about house sales in the past 6 months. Of the surveys sent out, 3.2% were returned. The results found that 92% of people did not sell their house in the past 6 months and 85% of people would expect a loss if they sold their house. The writer wants to use these results to conclude that the housing market is declining, and we are headed for a recession.
Explain the bias and sampling error in this study. (2 pts)
Should the writer conclude that the housing market is declining based upon this data? (2 pts)
Why or why not? (2 pts)
A homeowner is getting carpet installed. The installer is charging her for 250 square feet. She thinks this is more than the actual space being carpeted. She asks a second installer to measure the space to confirm her doubt. Write the null hypothesis Ho and the alternative hypothesis Ha. (2 pts)
Drug A is the usual treatment for depression in graduate students. Pfizer has a new drug, Drug B, that it thinks may be more effective. You have been hired to design the test program. As part of your project briefing, you decide to explain the logic of statistical testing to the people who are going to be working for you.
Write the research hypothesis and the null hypothesis. (2 pts)
Then construct a table like the one below, displaying the outcomes that would constitute Type I and Type II error. (2 pts)
Write a paragraph explaining which error would be more severe, and why. (2 pts)
Cough-a-Lot children’s cough syrup is supposed to contain 6 ounces of medicine per bottle. However, since the filling machine is not always precise, there can be variation from bottle to bottle. The amounts in the bottles are normally distributed with σ = 0.3 ounces. A quality assurance inspector measures 10 bottles and finds the following (in ounces):
5.95
6.10
5.98
6.01
6.25
5.85
5.91
6.05
5.88
5.91
Are the results enough evidence to conclude that the bottles are not filled adequately at the labeled amount of 6 ounces per bottle?
State the hypothesis you will test. (2 pts)
Calculate the test statistic. (2 pts)
Find the P-value. (2 pts)
What is the conclusion? (2 pts)
Calculate a Z score when X = 20, μ = 17, and σ = 3.4. (2 pts)
Using a standard normal probabilities table, interpret the results for the Z score in Problem 12. (2 pts)
Your babysitter claims that she is underpaid given the current market. Her hourly wage is $12 per hour. You do some research and discover that the average wage in your area is $14 per hour with a standard deviation of 1.9. Calculate the Z score and use the table to find the standard normal probability. Based on your findings, should you give her a raise? Explain your reasoning as to why or why not. (2 pts)
Tutor O-Rama claims that their services will raise student SAT math scores at least 50 points. The average score on the math portion of the SAT is μ=350 and σ=35. The 100 students who completed the tutoring program had an average score of 385 points.
Is the students’ average score of 385 points significant at the 5% and 1% levels to support Tutor O-Rama’s claim of at least a 50-point increase in the SAT score? (2 pts)
Is the Tutor O-Rama students’ average score of 385 points significantly different at the 5% and 1% levels from the average score of 350 points on the math portion of the SAT? What conclusion can you make, based on your results, about the effectiveness of Tutor O-Rama’s tutoring? (2 pts)
RES 710 UP Measures of Central Tendency & Normal Distribution Discussion
1. when distributions are skewed a researcher will eliminate some of the data to allow for a more normal distribution. How ...
RES 710 UP Measures of Central Tendency & Normal Distribution Discussion
1. when distributions are skewed a researcher will eliminate some of the data to allow for a more normal distribution. However, there are many problems with doing this, the most obvious being that you are no longer analyze the population you started out with. What are some other problems you can see with doing this? Is there ever an appropriate time to delete some data causing a skewed distribution?
2. How will you use measures of central tendency in your dissertation research or professional practice?
Saudi Electronic University Basic Concepts of Probability Presentation
I want a presentation with one of the chapters in the book that it containsI need to summarize this chapterTerms: 1- Intro ...
Saudi Electronic University Basic Concepts of Probability Presentation
I want a presentation with one of the chapters in the book that it containsI need to summarize this chapterTerms: 1- Introduction of the summary2- paraphrasing using your own words3- Summary should be 11 pages at least 4- I need 3-4 exercises to be included in the summary - Solved ones are ok to use-
Observational Study Analytical Review
You need to post 1 unique article/explanation about an experiment OR 1 unique article/explanation about an observational s ...
Observational Study Analytical Review
You need to post 1 unique article/explanation about an experiment OR 1 unique article/explanation about an observational study. You should begin a new thread with your topic, and include:1.) A link to the website or upload the relevant file.2.) The requested explanation or calculation 3.) Format your post like this: “Observational Study: In this article, Gallup polled 200 people about ....” so that it is clear to everyone which topic you have chosen.4.) Use “Observational Study” or “Experiment” in the title (no quotation marks necessary). Here are the details on the articles and discussion you should post to a new thread (choose only ONE):1.) Observational Study:a.How was the sample collected? (Use appropriate statistics terminology: Simple Random Sample, Stratified Random Sample, Cluster Sample, Voluntary Response)b. What is the sample size?c.What was the response rate?d.What variables were measured?e.Were the results displayed in a graph? If so, what type of graph was used? If not, what type of graph would be appropriate for displaying this data?f.What are potential sources of bias? g.What could be done to improve this study?2.) Experiment:a.Who or what is in the sample? What is the sample size?b. What is/are the treatments?c.What is the design of the experiment? Is it one we learned in class?d. Were the three principles of good experimental design (Randomization, Replication, Comparison/Control) used?e. What are the response variables? Are these variables categorical or quantitative? f.Were the results shown with a graph? If so, what kind of graph was used? If not, what kind of graph would be appropriate for displaying this data?g.What are some potential lurking variables? Explain your reasoning.
Null hypothesis and alternative hypothesis
Blood glucose levelsfor obese patients have a mean of 98 mg/dl with a standard deviation of 14.2 mg/dl. A resear ...
Null hypothesis and alternative hypothesis
Blood glucose levelsfor obese patients have a mean of 98 mg/dl with a standard deviation of 14.2 mg/dl. A researcher thinks that a diet high in raw cornstarch will have a positive effect on blood glucose levels. A sample of 28 patients who have tried the raw cornstarch diet have a mean glucose level of 103.4 mg/dl.
Conduct
the test that the raw cornstarch die had an effect at the 0.05 significance
level. Be sure to show all steps.
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