00:01
So on your question, you actually had the typed version in the question, and then you have a copy of a question printed in, and they're different.
00:09
So i'm going to answer the one that you typed in.
00:12
And so you had a set of data, and you had some differences, and i took the differences between they matched up people out by iq and some other standardized scores, and i'm going to take the first score minus the second score, and i got the differences to be six, three, four, negative one, three, two, two, and negative two.
00:35
And so we have one, two, three, four, five, six, seven differences here.
00:40
And so we want to calculate a 95 % confidence interval for the difference, for the mean difference.
00:51
And i had the values when i calculated these, i got that these differences.
00:57
At a mean of 2 .1429, and we have a sample size of 7, and we have a sample standard deviation of 2 .746, which is 6 there.
01:17
And i'm going to double check and make sure with 95 % confidence interval, that degrees of freedom, again, degrees of freedom is 6.
01:26
And i'm going to quick look in my table for that number.
01:31
So the 95 % number for six degrees of freedom corresponds with 2 .447...