"A poll of 600 voters showed 210 that were in favor of stricter gun control measures. Develop a 90% confidence interval estimate for the proportion of all the voters who are in favor of stricter gun control measures"

The 90% confidence interval estimate for the proportion of all the voters who are in favor of stricter gun control measures is (0.318, 0.382).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence interval , we have the following confidence interval of proportions.

In which

z is the zscore that has a pvalue of .

For this problem, we have that:

A poll of 600 voters showed 210 that were in favor of stricter gun control measures. This means that

90% confidence interval

So , z is the value of Z that has a pvalue of , so .

The lower limit of this interval is:

The upper limit of this interval is:

The 90% confidence interval estimate for the proportion of all the voters who are in favor of stricter gun control measures is (0.318, 0.382).

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