Question

A psychologist is examining the educational advantages of a preschool program. A sample of 16 fourth grade children is obtained. Half of these children (n = 8) attended preschool and the others (n = 8) had not. The psychologist records the scholastic achievement score for each child.

Preschool	No Preschool
12	11
20	14
15	18
18	8
22	12
10	13
14	16
17	8

a.            State the null hypothesis.

b.            Identify the appropriate statistical test

c.             Calculate the appropriate test statistic. Make sure to report the degrees of freedom for

the statistical test (if appropriate). You must show your work to receive full credit.

d.            State your conclusions (use a two-tailed test with a = .05 for all tests).

e.            Compute an effect size.

Answer 1