13

Question 1

5. regression to the mean

fluctuation)
-as increase number of tests, error decreases

6. • eg. assignments not random or low

Answer 1

threiats to internalvalidity

Question 2

eg. study on exercise program for patients with occluded arteries in leg

regression to the mean effect? selection threat?

Answer 2

bi

Question 3

use of control groups

decrease regression to mean threat (since both groups performance matched)

decrease testing threatss (since both groups recieved pretest would be same in both

Answer 3

hi

Question 4

2

Answer 4

t ests

Question 5

4

Answer 5

two way anova