A non-profit agency wants to estimate the proportion of adults
who answer yes to the question,...
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A non-profit agency wants to estimate the proportion of adultswho answer yes to the question, ‘Was there ever a time in your lifewhen you did not have a place to live?' They want to estimate thepercentage at the 95% level with a margin of error of nor more than0.5%.
Find a sample size that will guarantee their confidence intervalwill have a margin of error of less than 0.5%.
Why is the sample size you found in part likely to be far biggerthan necessary?
To get a better estimate of the sample size they will need, theytake a preliminary sample of 30 adults, of which 2 answered yes tothe question. About what sample size should they realisticallyexpect to need?
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12The sample size is so big because
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