SOLUTION: In a Gallup poll, 2400 randomly selected adults were surveyed and 39% of them said that they used the internet for shopping at least a few times a year. Find a 95% confidence inter
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Question 1152392: In a Gallup poll, 2400 randomly selected adults were surveyed and 39% of them said that they used the internet for shopping at least a few times a year. Find a 95% confidence interval estimate of the percentage of adults who use the internet for shopping. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! 95% half-interval is 1.96*sqrt(p*(1-p)/n)
this is 1.96*sqrt (.39*.61/2400)
=0.0195
so the interval is (0.3705, 0.4095)
