A sample of 20 insurance claims for automobile accidents (in $1000) gives the following values: XXXXXXXXXX XXXXXXXXXX XXXXXXXXXX XXXXXXXXXX Construct a 0.95 confidence interval on the mean value of...

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

Construct a 0.99 confidence interval on the mean weight of 12-hour-old babies in Exercise 11.

Exercise 11

It is said that the average weight of healthy 12-hour-old infants is supposed to be 7.5 lb. A sample of newborn babies from a low-income neighborhood yielded the following weights (in pounds) at 12 hours after birth:

6.0 8.2 6.4 4.8

8.6 8.0 6.0

7.5 8.1 7.2

At the 0.01 significance level, can we conclude that babies from this neighborhood are underweight?