SOLUTION: Two samples are taken with the following numbers of successes and sample sizes
r1 = 29
r2 = 31
n1 = 63
n2 = 77
Find a 98% confidence interval, round answers to the nearest
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Question 1157147: Two samples are taken with the following numbers of successes and sample sizes
r1 = 29
r2 = 31
n1 = 63
n2 = 77
Find a 98% confidence interval, round answers to the nearest thousandth.
_______ < p1−p2 < _______
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
This is ready made to be put into a calculator.
(-.14, +.25) is the 98% CI.
By hand, the half-interval or z*SE is z(0.99)*sqrt (p1(1-p1)/n1)+(p2(1-p2)/n2))
=2.33*sqrt(0.00706)
and to rounding error, you get a half-interval of 0.195, which is half the difference between -.14 and +.25 above.
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