A researcher looks at the effect of 3 different drugs on 3 different groups of 10 people. Numbers refer to stress levels, with lower numbers being lower stress.
Drug 1
Before After
25 18
23 20
27 19
27 22
21 17
30 18
22 15
20 19
25 17
29 20
Drug 2
Before After
26 24
21 23
20 19
22 17
18 14
27 21
20 22
21 23
21 18
18 17
Drug 3
Before After
23 15
19 15
21 22
18 15
22 18
23 16
22 21
18 17
17 14
19 16
a) What type of experimental design is being used? What is (are) the independent and dependent variable(s)? How many levels are there of each?
b) Analyze the data. Are there significant differences between the 3 drugs?
c) Provide a summary table and report results.