00:01
All right, following is a solution for 952.
00:04
So we look at a pre and a post test, and we're looking at, so the mean average of the pre -test was 75 .85 for racial tolerance, and then the post -test was 80 .35.
00:15
And for part a, it says the researcher reported that those were the sample means.
00:20
Why is it dangerous to gauge the effectiveness of the program based only on these summary stats? well, we're missing a key item here, and that's the standard deviation.
00:28
So we are lacking the standard deviation.
00:34
Deviation.
00:37
So we don't know if a 5 % difference is big because the standard deviation could be, you know, significantly large and that wouldn't really be a difference.
00:46
So standard deviation is really important here.
00:48
Part b, it says the t test gave us t equals 4 .5 and the p value is less than 0 .001.
00:55
So interpret this result...