Background

A simple random sample of 100 high school upperclassmen was selected from a large school district. The grade level of each student was recorded, and each student was asked the following questions:

A. Have you ever had a part-time job?

B. If you answered yes to the previous question, was your part-time job in the summer only?

The responses are summarized in the table below.

Uperclasssmen Job Data
Grade Job Experience Total
Never Had Job Summer Only Year Round
11th 21 15 12 48
12th 31 13 8 52
Total 52 28 20 100



Association Summary

Because this was a sample of about 50 students per grade from what is described as a large school district we cannot draw definitive parameters from this data, it would be helpful if more students could be surveyed. The display in part (a) reveals that for our random sample a larger percentage of Juniors have had a job than Seniors both year round and only in the summer. We also see that the upperclassmen are almost evenly split between never having a job and having a part time job.