In order to estimate the percent of an electorate who prefer the Republican candidate to all others, how large a sample size should be used in order to have a probability at least 0.95 that the error...

In order to estimate the percent of an electorate who prefer the

Republican candidate to all others, how large a sample size should

be used in order to have a probability at least 0.95 that the

error of the estimate will not exceed 2.5 percentage points?

What sample size is required if the error is not to exceed 2 percentage points? Use Problem 5.6.6.