SOLUTION: A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.0
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Question 1114783: A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 99% confidence if
(a) she uses a previous estimate of 0.36?
(b) she does not use any prior estimates? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! 0.02=2.576*sqrt(.36*.64/n)
0.00776=sqrt(.36*.64/n)
0.000060279=.36*.64/n, squaring both sides
n=(.2304)/0.0000602668
n=3822.21 or 3823
for p=0.5, where the product of 0.5 and 0.5 is a maximum for p(1-p)
n=.25/0.0000602668, or n=4148.22 rounding to 4149.
