0.5 pts A psychologist discusses a patient with illness...

0.5 pts A psychologist discusses a patient with illness anxiety disorder (hypochondriasis) this way: "She focuses on her health so that she can be protected from the anxiety her underlying conflicts cause. Then, when she is shown attention and sympathy, her dependency needs are met." This psychologist O probably rejects the psychoanalytic perspective O is discussing primary and secondary gain O takes a diathesis-stress approach to illness anxiety disorder (hypochondriasis) O probably agrees with the behavioral perspective

Transcript

00:01 In this question we're given a table of scores before and after and we're asked to do a repeated measures t -test.

00:12 So repeated measures t -test and we're asked to do it with two tails.

00:23 So a two tailed test with a significance level of 0 .05.

00:31 Now in order to do a repeated measures t -test we need to tabulate the differences here.

00:36 So what we can do is pre minus post and fill that out.

00:44 So 45 minus 28 is 17.

00:47 Then we have 5 minus 1, 11, 1, 13, 12 and 1.

01:03 Now we're going to call these differences d.

01:08 Now what we can do is we can calculate d bar by summing them all up and dividing by n.

01:15 Now in this case we have 1, 2, 3, 4, 5, 6, 7, 8 as n.

01:23 So that gives us d bar is equal to, so let's sum them all up, 17 plus 5 minus 1 plus 11 plus 1 plus 13 plus 12 plus 1.

01:36 Divide that by 8 and we get 7 .375.

01:44 Now let's remember that we can calculate our sample standard deviation for d as the square root 1 over n minus 1 times the sum of the squares minus the sum of d squared divided by n, which is the same as 1 over n minus 1 times the sum of the squares minus n times d bar squared.

02:22 So that's the square root of 1 over 7 times 17 squared plus 5 squared plus 1 squared plus 11 squared plus 1 squared plus 13 squared plus 12 squared plus 1 squared.

02:37 And then take off 8 times 7 .375 squared and that gives us the standard deviation on d is, and let's put that in the middle so it's with the rest of our summary statistics, 6 .7175.

03:04 Okay, so now we've got our summary we can do our t -test...

Question

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