Mathematics, 15.04.2020 04:34 stephycake9768
A researcher wants to estimate the mean age of all Business Week readers at a 99% confidence level. The standard deviation of ages of all Business Week readors is nine years. The sample size that will yield a maximum error of estimate within three years of the population mean is at least:
A. 60
B. 97
C. 185
D. 8
Answers: 2
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
.
, so 
is the standard deviation of the population and n is the size of the sample.
. So
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A researcher wants to estimate the mean age of all Business Week readers at a 99% confidence level....
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