Chapter 12, Problem 15PT4

To determine

To Explain: the meaning of 95 percent confidence was 3 percent of poll’s margin of error.

Answer to Problem 15PT4

The poll used a method that provides an estimate within 3% of the truth about the population 95% of the time

Explanation of Solution

In the poll-based sample, 54 percent are the point figures. It is not the true proportion of the population until a survey (which cannot be linked to polling) has been conducted.

3% is the sample data margin of error, only 1 answer is the best way to test a confidence interval. For instance, this is not a) since the true percent (as the true percent does not change) is either one or one percent.

If this method is used thousands of times, an approximation is made of around 95% of the intervals within 3% of the time if this method is used

Hence, the correct option is (b)