32. C had chickenpox. Find the number of people who must be surveyed if you want

Question

32. C had chickenpox. Find the number of people who must be surveyed if you want to be 90% con- fident that the sample percentage is within two percentage points of the true percentage for the population of all adults. hickenpox You plan to conduct a survey to estimate the percentage of adults who have a. Assume that nothing is known about the prevalence of chickenpox b. Assume that about 95% of adults have had chickenpox. c. Does the added knowledge in part (b) have much of an effect on the sample size?

Explanation / Answer

A confidence level is the likelihood that the sample you pick up matters in the results you get. The calculation is done in the following way, if you pick up 30 more samples randomly from ur population, you should see how often is the result that you got in your one sample significantly differ those other 30samples.

If the population selected is 100 so a random of 74 people should be surveyed for a confidence level of 90% with a margin error of 1-2%.

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