Question

HW 6: z-test, t-test for independent samples, t-test for related samples, 1-way ANOVA

Researchers wanted to explore different treatment methods to effect memory skills in high school freshmen. Subjects were given a memory test (under multiple conditions) these were the results:

Group 1

          10,   8,   9,   11,   8,   9,   7,   6,   9,   8

Group 2

          12, 10, 11,   9, 13, 8,   9, 12, 11, 11

Group 3

          10,   9,   10,   9, 11, 8,   7,   9,   10,   11

Using the data above, run (all steps for) the following statistic tests:

1. z-test (non-directional, by hand) – using group 1 as the population and group 2 as your sample
2. t-test independent samples (directional, in SPSS) – using groups 1 and 2
3. t-test related samples (directional, by hand AND non-directional in SPSS) – using groups 1 and 2
4. 1-way ANOVA (non-directional (as it must be) in SPSS) – using all three groups

- for all tests use an alpha of 0.05.

- This HW has 5 problem sets (4 listed, but #3 is done twice by hand and in SPSS requiring all steps for 2 separate statistics tests).

- All SPSS results must be printed and turned in with HW

Answer 1