confidence intervals 27

March 2020

Week 7 Assignment: Lab

Due Apr 19 by 11:59pm
Points 50
Submitting a file upload

Required Resources

Read/review the following resources for this activity:

OpenStax Textbook: Chapter 8
Lesson
Chamberlain University Library

Scenario/Summary

The highlight of this week’s lab is confidence intervals and the use of these intervals in the health sciences. There is a short reading that specifically relates confidence intervals to health sciences and then you are asked to demonstrate your knowledge of confidence intervals by applying them in a practical manner.

Deliverables

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

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), discuss your method of collection for the values that you are using in your study. What are some faults with this type of data collection? What other type of data collection could you have used, and how might this have affected your study?

Step 4: Now use the Week 6 Spreadsheet (Links to an external site.) to help you with calculations for the following questions/statements.

Give a point estimate for the average height of all people at the place where you work. Start by putting the ten heights you are working with into the blue Data column of the spreadsheet. What is your point estimate, and what does this mean?
Find a 95% confidence interval for the true mean height of all the people at your place of work. What is the interval?
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”).
Post a screenshot of your work from the t value Confidence Interval for Âµ from the Confidence Interval tab on the Week 6 Excel spreadsheet

Step 5: Now, find a 99% confidence interval for the same data. Would the margin of error be larger or smaller for the 99% CI? Explain your reasoning.

Step 6: Save the Week 7 Lab document with your answers and include your name in the title.

Step 7: Submit the document.

Grading

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

Course Outcomes (CO): 8

Due Date: By 11:59 p.m. MT on Sunday

Rubric

Week 7 Assignment: Lab

Criteria

Ratings

Pts

This criterion is linked to a Learning Outcome Data Collection and Pitfalls Range

12.0 pts Proficient Lab includes all of the following: *10 data points/heights *method of collection *faults with method of collection used *a different method of collection

10.2 pts Above Average Lab includes 3 out of 4 of the following: *10 data points/heights *method of collection *faults with method of collection used *a different method of collection

8.4 pts Average Lab includes 2 out of 4 of the following: *10 data points/heights *method of collection *faults with method of collection used *a different method of collection

6.6 pts Needs Improvement Lab includes 1 out of 4 of the following: *10 data points/heights *method of collection *faults with method of collection used *a different method of collection

0.0 pts No Effort

12.0 pts

This criterion is linked to a Learning Outcome Estimate a Confidence Interval

15.0 pts Proficient Lab includes all of the following: *point estimate *95% confidence interval *screenshot of Excel spreadsheet *practical interpretation on confidence interval

12.75 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

10.5 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

8.25 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

0.0 pts No Effort

15.0 pts

This criterion is linked to a Learning Outcome Interpret a Confidence Interval

15.0 pts Proficient Lab addresses all of the following well *a 99% confidence interval *comparison of margins of error for 99% and 95% *explanation of reasoning

12.75 pts Above Average Lab addresses 2 out of 3 of the following well *a 99% confidence interval *comparison of margins of error for 99% and 95% *explanation of reasoning

10.5 pts Average Lab addresses 1 out of 3 of the following well *a 99% confidence interval *comparison of margins of error for 99% and 95% *explanation of reasoning

8.25 pts Needs Improvement Lab mentions but does not explain fully any of the following *a 99% confidence interval *comparison of margins of error for 99% and 95% *explanation of reasoning

0.0 pts No Effort

15.0 pts

This criterion is linked to a Learning Outcome Grammar and Formatting

8.0 pts Proficient Lab is easy to read and presents material in a logical order with no grammatical errors.

6.8 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.

5.6 pts Average Lab is easy to read and has few grammatical errors, but it is not logically organized.

4.4 pts Needs Improvement There are significant grammatical errors and organizational issues that distract from readability.

0.0 pts No Effort

8.0 pts

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confidence intervals 27

Week 7 Assignment: Lab

Rubric

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