Chapter 8.1, Problem 44E

a.

To determine

To find: The $95\%$ confidence interval for the mean number of personal computers.

b.

To determine

To explain: Whether the margin of error would be larger or smaller, if the sample size was 100 instead of 150.

c.

To determine

To explain: Whether the margin of error would be larger or smaller, if the confidence level was $98\%$ instead of $95\%$ .

d.

To determine

To find: Whether the mean number of personal computers is greater than 1.25.