In: Statistics and Probability
Two samples are taken with the following numbers of successes
and sample sizes
r1r1 = 38 r2r2 = 39
n1n1 = 86 n2n2 = 63
Find a 97% confidence interval, round answers to the nearest
thousandth.
We have given,
r1=38
n1=86
r2=39
n2=63
Level of significance = 0.03
Z critical value (by using Z table)=2.17
Estimate for sample proportion 1
Estimate for sample proportion 2
Confidence interval formula is
=(-0.3535, -0.0007)
Lower limit for confidence interval=-0.354
Upper limit for confidence interval is=-0.001