Question: A study is proposed to determine how much students are spending on textbooks. A random sample of 28 students was taken last semester and the amount of that each student spent on textbooks was recorded. The statistics found was x̄ = $103 and s = $8. Use these data to create a 90% confidence interval for the population mean of the amount spent on textbooks.

1. Express the Confidence Interval using the proper test statistic.
2. Find the test statistic (show your calculations).
3. Express the test statistic as a probability
4. Plot the appropriate graph (Standard Normal Distribution OR the Student’s t Distribution). Put a title to the graph, label the horizontal axis and indicate the mean. Shade the area that we are looking for.
5. Calculate the Confidence Interval (show your calculations).
6. Give a brief interpretation of the confidence interval in the context of this problem.

Price: $2.99

Solution: The downloadable solution consists of 2 pages
Deliverable: Word Document