Chapter PIII, Problem 35RE

(a)

To determine

To find: the sampling technique used by the pollsters to think.

Explanation of Solution

It assumes that pollsters use a simple random sampling approach for political patties, but same number of respondents for each group of age helps. the stratified random sampling approach

(b)

To determine

To find: Democrats were the percentage of the people surveyed.

Explanation of Solution

The number of Democratic individuals surveyed is:

There were 1404 Democrats sampled and a total of 4002 for all political parties surveyed.

  $\begin{array}{c}\text{Percent}\text{of}\text{people}\text{survery}\text{in}\text{democrats}\text{=}\frac{\text{Democrats}\text{surveyed}}{\text{all}\text{politicle}\text{party}\text{surveyed}}\times 100\\ =\frac{1404}{4002}\times 100\\ =35.1\%\end{array}$

35.1 percent is the proportion of people polled by Democrats.

(c)

To determine

To find: this is a reasonable approximation of the number of voters who are eligible Democrats in the United States.

Explanation of Solution

It don't think this is a fair approximation of the number of registered Democrats in the United States since this telephone survey is likely to systemically eliminate those who don't have a telephone because there are more of them in the Democratic Party. Socio-economic status is related to membership, which may be an issue.

(d)

To determine

To Find: that the question seems to be being resolved by the pollsters.

Explanation of Solution

In constructing this survey, it assumes that the pollsters tried to address whether or not the age of the political party is linked.