Mathematics, 14.07.2019 12:00 DesperatforanA
Beth wants to determine a 80 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. how large of a sample must she have to get a margin of error less than 0.04? [if no estimate is known for p, let p^ = 0.5]
Answers: 1
, and a confidence level of 
, we have the following confidence interval of proportions.
.
, z is the value of Z that has a pvalue of 
, so 
.
, since no estimate is know. So
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