Instructions

Steps to Complete the Week 7 Lab

Step 1: Find these articles in the Chamberlain Library. Once you click each link, you will be logged into the Library and then click on “PDF Full Text”.

Step 2: Consider the use of confidence intervals in health sciences with these articles as inspiration and insights.

Step 3: Using the data you collected for the Week 5 Lab (heights of 10 different people that you work with plus the 10 heights provided by your instructor), discuss your method of collection for the values that you are using in your study (systematic, convenience, cluster, stratified, simple random). What are some faults with this type of data collection? What other types of data collection could you have used, and how might this have affected your study?

Step 4: Now use the Week 6 Spreadsheet to help you with calculations for the following questions/statements.

a) Give a point estimate (mean) for the average height of all people at the place where you work. Start by putting the 20 heights you are working with into the blue Data column of the spreadsheet. What is your point estimate, and what does this mean?

example of adding a point estimate to spreadsheet

b) Find a 95% confidence interval for the true mean height of all the people at your place of work. What      is the interval? [see screenshot below]

c) Give a practical interpretation of the interval you found in part b, and explain carefully what the output       means. (For example, you might say, “I am 95% confident that the true mean height of all of the              people in my company is between 64 inches and 68 inches”).

d) Post a screenshot of your work from the t value Confidence Interval for µ from the Confidence                  Interval tab on the Week 6 Excel spreadsheet

 Step 5: Now, change your confidence level to 99% for the same data, and post a screenshot of this table, as well.

Step 6: Compare the margins of error from the two screenshots. Would the margin of error be larger or smaller for the 99% CI? Explain your reasoning.

Step 7: Save the Week 7 Lab document with your answers and include your name in the title.

Step 8: Submit the document.

Requirements

The deliverable is a Word document with your answers to the questions posed below based on the article you find.

Required Software

  • Microsoft Word
  • Internet access to read articles

Grading

This activity will be graded based on the Week 7 Lab Rubric.

Outcomes

CO 8: Given a sample dataset, estimate and interpret the confidence intervals for population mean or proportion.

Due Date

By 11:59 p.m. MT on Sunday

Rubric

Week 7 Assignment: Lab
Week 7 Assignment: Lab
CriteriaRatingsPts
Data Collection and Pitfalls Range
 
 
 
12 pts
Proficient Lab includes all of the following: *20 data points/heights *method of collection *faults with method of collection used *a different method of collection
 
 
10 pts
Above Average Lab includes 3 out of 4 of the following: *20 data points/heights *method of collection *faults with method of collection used *a different method of collection
 
 
8 pts
Average Lab includes 2 out of 4 of the following: *20 data points/heights *method of collection *faults with method of collection used *a different method of collection
 
 
6 pts
Needs Improvement Lab includes 1 out of 4 of the following: *20 data points/heights *method of collection *faults with method of collection used *a different method of collection
 
 
0 pts
No Effort
 
12 pts
Estimate a Confidence Interval
 
 
 
15 pts
Proficient Lab includes all of the following: *point estimate *95% confidence interval *screenshot of Excel spreadsheet *practical interpretation on confidence interval
 
 
12 pts
Above Average Lab includes 3 out of 4 of the following: *point estimate *95% confidence interval *screenshot of Excel spreadsheet *practical interpretation on confidence interval
 
 
10 pts
Average Lab includes 2 out of 4 of the following: *point estimate *95% confidence interval *screenshot of Excel spreadsheet *practical interpretation on confidence interval
 
 
8 pts
Needs Improvement Lab includes 1 out of 4 of the following: *point estimate *95% confidence interval *screenshot of Excel spreadsheet *practical interpretation on confidence interval
 
 
0 pts
No Effort
 
15 pts
Interpret a Confidence Interval
 
 
 
15 pts
Proficient Lab addresses all of the following well *a 99% confidence interval *screenshot of Excel spreadsheet *comparison of margins of error for 99% and 95% *explanation of reasoning
 
 
12 pts
Above Average Lab addresses 2 out of 3 of the following well *a 99% confidence interval *screenshot of Excel spreadsheet *comparison of margins of error for 99% and 95% *explanation of reasoning
 
 
10 pts
Average Lab addresses 1 out of 3 of the following well *a 99% confidence interval *screenshot of Excel spreadsheet *comparison of margins of error for 99% and 95% *explanation of reasoning
 
 
8 pts
Needs Improvement Lab mentions but does not explain fully any of the following *a 99% confidence interval *screenshot of Excel spreadsheet *comparison of margins of error for 99% and 95% *explanation of reasoning
 
 
0 pts
No Effort
 
15 pts
Grammar and Formatting
 
 
 
8 pts
Proficient Lab is easy to read and presents material in a logical order with no grammatical errors.
 
 
6 pts
Above Average Lab is easy to read and presents material in a logical order. There are a few grammatical errors but they do not distract from readability.
 
 
5 pts
Average Lab is easy to read and has few grammatical errors, but it is not logically organized.
 
 
4 pts
Needs Improvement There are significant grammatical errors and organizational issues that distract from readability.
 
 
0 pts
No Effort
 
8 pts
Total Points: 50
 
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