32. Chickenpox You plan to conduct a survey to estimate the percentage of adults who have 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. 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?
32. Chickenpox You plan to conduct a survey to estimate the percentage of adults who have 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. 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?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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
Transcribed Image Text:Determining Sample Size. In Exercises 31–38, use the given data to find the minimum
sample size required to estimate a population proportion or percentage.

Transcribed Image Text:32. Chickenpox You plan to conduct a survey to estimate the percentage of adults who have
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.
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?
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