Posted by **Cyn** on Tuesday, May 3, 2011 at 8:06pm.

Twenty (20) students randomly assigned to an experimental group are studying for a test while listening to classical music. Thirty (30) students randomly assigned to a

Control group are studying for the same test in complete silence. Both groups take the test after studying for two weeks, and their performance on the test is as follows:

Exp Cont

30 30

18 28

20 32

40 42

50 30

40 40

40 42

48 34

56 36

42 24

32 38

36 32

38 20

40 30

34 42

40 40

30 30

50 20

48 20

30 18

16

24

28

22

34

22

30

32

30

30

In this problem, you will determine what the experimenter should conclude.

Using the 5% level of significance (alpha):

A) Determine the null and research hypotheses;

B) Select the correct template (templates for the Single Sample t-test, the Independent Samples t-test, and the ANOVA are included in the tabs that follow this tab);

C) Complete each of the blank cells in the template selected (round to two decimal places).

D) State your conclusion, making reference to the test statistic, the critical value, the effect size, and your hypotheses.

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