Question

n a certain rural county, a public health researcher spoke with 315 residents 65-years or older, and 136 of them had obtained a flu shot. The researcher wants to calculate a 90% confidence interval for the percent of the 65-plus population that were getting the flu shot.

define your variables.

As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 1.96 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval

Give your answer in interval notation rounded to 3 decimal places

Answer 1

A 90% confidence interval for the percent of the 65-plus population that were getting the flu shot is (0.386, 0.478)