00:01
Here's a solution with the computer -assisted instruction to lecture results.
00:06
So a survey found that 83 % of men questioned preferred computer -assisted instruction to lecture, and 75 % of women preferred computer -assisted instruction to lecture.
00:16
So there were 100 randomly selected individuals in each sample.
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At the 0 .05 level test the claim that there is no difference in the proportion of men and the proportional women who favor computer -assisted instruction over lecture.
00:29
Find the 95 % confidence interval for the difference of two proportions.
00:32
So we're going to find the 95 % confidence interval in order to answer this question.
00:37
All right, so i'm going to take the men minus women.
00:41
So we take stat tests, and then we're going to do the 2 prop z -n.
00:45
So it's that 83 % out of 100.
00:47
So that's just 83 out of 100.
00:49
And then 75 % out of 100, and we want to be 95 % confidence.
00:54
So this is the, oops, did it do many times...