SOLUTION: A sample of 300 high school juniors found that 195 of them took the SAT more than once. Find the 99% confidence interval for the proportion of all high school juniors who took the
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Question 1141191: A sample of 300 high school juniors found that 195 of them took the SAT more than once. Find the 99% confidence interval for the proportion of all high school juniors who took the SAT more than once. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! The point estimate of the probability is 195/300=0.65
the 99% CI is p hat, 0.65 +/- z (2.576 for 99% CI) *sqrt(p(1-p)/n), which is sqrt (0.65*0.35/300)
this is 0.65+/-2.576*0.0275
=0.65+/-0.0709
(0.58, 0.72)
