SOLUTION: In a random sample of 200 observations, we found the proportion of successes to be 48% use a 90% degree of confidence to estimate the population proportion of successes . repeat wi
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Question 1120679: In a random sample of 200 observations, we found the proportion of successes to be 48% use a 90% degree of confidence to estimate the population proportion of successes . repeat with n 500 Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! The half interval for 90% CI is +/- z*SE, where z is 1.645 and SE is sqrt(.48*.52/200)
1.645*0.0353 or 0.0581
So the interval is 48%+/-5.81%
or (0.4219, 0.5381)
For n=500 the SE is 0.0223 and the half interval 0.0368
(0.4432, 0.5168)
