Chapter 5.2, Problem 5.36E

(a)

To determine

To explain does the larger random sample reduce the bias of the poll result.

Explanation of Solution

It does not reduce the bias of the poll because it cannot correct the methodological issues, such as undercoverage or nonresponse, that result in bias.

(b)

To determine

To explain does it reduces the variability of the result.

Explanation of Solution

It does reduce variability because it decreases the standard deviation of the sample statistics.