Posted: April 17th, 2021

**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

**Prepare**

- Download the
__Week 7 Lab Lecture Notes.__ - Follow along with he Week 7 Lab Video and fill out the Week 7 Lab Lecture Notes as you watch the video.

**Demonstrate**

**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?

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.

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