Stats 110A Name:
Spring 2002 ID:

Quiz 1

Below are the risk ratings from 24 people who rated the riskiness of flying on a commercial airplane. Create a stem-and-leaf plot. What’s the typical value? Why?

50 0 5 40 0 50 40 5 3 20 1 30 0 0 3 5 2 0 75 10 20 20 50 1

0|0505310035201
1|0
2|000
3|0
4|00
5|000
6|
7|5
8|
9|

The question about a typical value is rather vague, and deliberately so, and the reason for asking “why” is to give you a chance to justify your answer. (A few took this to be an invitaiton to explain why people assigned that sort of a risk value to airplane flying. If this was an explanation that fit the observation and was logically consistent, it was accepted.) The sort of justificaiton I was looking for was that it was the mode, or approximately the average. Ranges of values were accepted as well.