Using the data from Exercise 4, construct a stem and leaf plot and a box plot (Section 1.6). Do these graphs indicate that the assumptions discussed in Section 4.5 are valid? Discuss possible...

Using the data from Exercise 4, construct a stem and leaf plot and a box plot (Section 1.6). Do these graphs indicate that the assumptions discussed in Section 4.5 are valid? Discuss possible alternatives.

Exercise 4

A sample of 20 insurance claims for automobile accidents (in $1000) gives the following values:

1.6 2.0 2.7 1.3 2.0

1.3 0.3 0.9 1.2 1.2

0.2 1.3 5.0 0.8 7.4

3.0 0.6 1.8 2.5 0.3

Construct a 0.95 confidence interval on the mean value of claims. Comment on the usefulness of this estimate