Assume that the population has a normal distribution. use a 95% Confidence level. In a survey of 3005 adults aged 57 through 85 years, it was found that 82% of them use at least one prescription...

Assume that the population has a normal distribution. use a 95% Confidence level.

In a survey of 3005 adults aged 57 through 85 years, it was found that 82% of them use at least one prescription medication.

1. How many people use at least one prescription medication.

2. Find the margin of error E that corresponds to a 95% confidence level.

3. Find the 95% confidence interval estimate of the population proportion p.

4. How many people must be surveyed if we want a confidence level of 99% and a margin of error of four percentage points? Use the sample proportion is 82%.