Dr pox plans to conduct a survey to estimate the percentage of adults in 2020 who have had chickenpox he reviewed a previous study that reported 60% of all adults had contracted chickenpox at some time in their life find the number of people who must be surveyed if you want to be 92% confident with a margin of error of 2%

We must sample 2305 people.

Step-by-step explanation:

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

In which

z is the zscore that has a pvalue of .

The margin of error is:

For this problem, we have that:

92% confidence level

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

Number of people who must be surveyed:

We must sample n people.

n is found when

So

Rounding up

We must sample 2305 people.

answer: 1, 3 and 5 are correct

step-by-step explanation: