The number of hours of reserve capacity of

10

randomly selected automotive batteries is shown to the right.

1.77	1.84	1.59	1.62	1.72
1.95	1.37	1.54	1.47	2.09

Assume the sample is taken from a normally distributed population. Construct

98%

confidence intervals for (a) the population variance

2

and (b) the population standard deviation

.

Part 1

(a) The confidence interval for the population variance is

Part 2

Interpret the results.

A. With 22% confidence, it can be said that the population variance is between enter your response here and

enter your response here.

B. With 98% confidence, it can be said that the population variance is between

C. With 22% confidence, it can be said that the population variance is greater than

D. With 98% confidence, it can be said that the population variance is less than

Part 3

(b) The confidence interval for the population standard deviation is

Part 4

Interpret the results.