Mathematics Lab Assignment

 prepare

• Read the two articles below:

El-Masri, M. M. (2012). Confidence intervals: Part 1Links to an external site.. Canadian Nurse, 108(2), 8–8.

El-Masri, M. M. (2012). Confidence intervals: Part 2Links to an external site.. Canadian Nurse, 108(5), 10–10.

Step 1

 Summarize the assigned articles and explain how confidence intervals can be used in health sciences.   

step 2

 Using the data you collected for the Week 5 Lab Assignment (heights of 10 different people you collected 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 3

Now, use the Week 6 Excel Spreadsheet to help you with calculations for the following questions/statements. 

1. Give a point estimate (mean) for the average height of all people in your selected population. 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? 

1. 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]

1. 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"). 

step 4

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

Step 5

 Compare the margins of error from the two screenshots. Is the margin of error larger or smaller for the 99% CI? Explain the reasoning behind the different margins of errors.  

step 6

Save the Week 7 Lab Assignment template with your answers and include your name in the title. Then, upload and submit the document.