# Chapter 8 Projects

## Project A: Constructing a Confidence Interval for a Population Mean

Choose a study question and follow the given steps to construct a confidence interval for a population mean.

Choose one of the study questions below, or write your own study question for which you could collect data from students on your campus to estimate a population mean.

• How many hours per week do college students on your campus study?

• What is the mean number of parking tickets college students on your campus receive per semester?

• What is the mean price of rent paid per month by college students on your campus?

For the study question you chose, construct a confidence interval for that parameter by doing each of the following.

1. Collect data on your study question from at least $30$ students on your campus.

2. Calculate the sample mean and sample standard deviation of your sample data.

3. Calculate the margin of error for a $95%$ confidence interval using your sample statistics.

4. Construct a $95%$ confidence interval using your sample statistics.

5. Write a summary of your results.

## Project B: Constructing a Confidence Interval for a Population Proportion

Choose a study question and follow the given steps to construct a confidence interval for a population proportion.

Choose one of the study questions below, or write your own study question for which you could collect data from students on your campus to estimate a population proportion.

• What percentage of college students on your campus own a smartphone?

• What percentage of college students on your campus are seeking a degree in your field of study?

• What percentage of college students on your campus live in on-campus housing?

For the study question you chose, construct a confidence interval for that parameter by doing each of the following.

1. Collect data on your study question from at least $30$ students on your campus.

2. Calculate the sample proportion from your sample data.

3. Calculate the margin of error for a $90%$ confidence interval using your sample statistics.

4. Construct a $90%$ confidence interval using your sample statistics.

5. Write a summary of your results.