Consider the television picture tube brightness experiment described in Exercise 8-35.

(a) For the sample size n  10, do the data support the claim that the standard deviation of current is less than 20 microamps?

(b) Suppose that instead of n  10, the sample size was 51.

Repeat the analysis performed in part

(a) using n  51.

(c) Compare your answers and comment on how sample size affects your conclusions drawn in parts

(a) and (b).