Week7Labfinished

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Chamberlain College of Nursing *

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C NURSIN

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Statistics

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Feb 20, 2024

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docx

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Week 7 Lab Assignment Name: _______Cydney Spak ______ Instructor Name: __Hernandez _ Please use this template to help answer the questions listed in the lab instructions. The “steps” below refer to the steps listed in the lab instructions. Type your answers and post your screenshots in the spaces given. 1. Write a paragraph summarizing what you learned from the articles provided. Consider the use of confidence intervals in health sciences with these articles as inspiration and insights. Confidence intervals are reliable indicators of soundness, according to the first article. The verbal illustration of confidence intervals and their meaning were described as well. In the second article, there is explanation of how an overlap in CI’s can both represent the same “true” value of the population. In this manner, you can use either of the confidence intervals to draw statistical significance conclusions. Data Collection Use the data set you collected for the Week 5 lab (heights of 10 different people plus the 10 heights provided by your instructor). ( NOTE: This is NOT the data used in the lab video, which is about midterm grades. Do not use the midterm grades data.) 1

Provide a screenshot of your Week 5 Data (20 Heights) Summarize the Preliminary Calculations (Round to 2 decimal places): Sample Mean: _67.7_ Standard Deviation: _3.59__ Your Height: _68.0_____ Please answer the following questions in complete sentences: 1. Discuss your method of collection for the values that you are using in your study (systematic, convenience, cluster, stratified, simple random). I used convenience sampling and utilized the heights of those who are all family members of mine. 2. What are some faults with this type of data collection? 2

One fault with this type of data collection, particularly the use of solely family members is that genetics effect height and much of my family are very similar in height. If someone were looking for variation in data, this might not be the best way to gather that information. 3. What other types of data collection could you have used, and how might this have affected your study? Systematic sampling could have been used and the heights of every nth person in, say a class or of those who you happen to work with in a day could be asked and their heights gathered to reach the goal of 10 heights. This would provide a higher variation in heights quite possibly as well. Calculation of 95% Confidence Interval 1. Give a point estimate (mean) for the average height of all people at the place where you work. What is your point estimate, and what does this mean? Where I work, the point estimate for height is 67.65 inches. This is the best guess of a data samples “average height”. 2. Find a 95% confidence interval for the true mean of heights. What is the interval? [Provide a Screenshot of your work from the t value Confidence Interval for µ from the Confidence Interval tab on the Week 6 Excel spreadsheet] 95% confidence interval is 59.77” to 75.53” 3

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3. 3. 3. Give a practical interpretation of the 95% confidence interval [ Write a complete sentence] . With 95% confidence, everyone within the sample group has a height that falls within 59.77” and 75.53”. Calculation of 99% Confidence Interval Now, change your confidence level to 99% for the same data. 1. Find a 99% confidence interval for the true mean of heights. What is the interval? [Provide a Screenshot of your work from the t value Confidence Interval for µ from the Confidence Interval tab on the Week 6 Excel spreadsheet] 99% confidence interval is 55.83” to 79.47” 2. Give a practical interpretation of the 99% confidence interval [ Write a complete sentence] . With 99% confidence, the heights of the sample group falls within 55.83” and 79.47”. 4

Compare Margins of Error 1. Would the margin of error be larger or smaller for the 99% CI? Explain your reasoning. The margin of error for a 99% CI is 2.27 which is larger than the margin of error for the CI of 95% (1.73). 2. As the confidence level increases, what happens to the Margin of Error? As the confidence level increases, the margin of error increases. Save and Submit Be sure your name is on the Word document, save it, and then submit it. In the assignment module, click “start assignment” and then “upload file” and “submit assignment”. 5