Finding Confidence Intervals. In Exercises 9-16, assume that each sample is a simple random sample obtained from a population with a normal distribution.

Professor Evaluation Scores Listed below are student evaluation scores of professors from Data Set 28 "Course Evaluations" in Appendix B. Construct a 95% confidence interval estimate of o for each of the two data sets. Does there appear to be a difference in variation?

Female 

4.4 

3.4

4.8

2.9

4.4

4.9

3.5

3.7

3.4

4.8

Males

4.0

3.6

4.1

4.1

3.5

4.6

4.0

4.3 

4.5

4.3