Test Yourself
Take this quiz and see how you do. Select the correct answers by using the drop down menus. Once you are done, click submit to see your score! The ones that you get wrong will have a check!
1. Which of the following experiments has more within-group variability?
-- Choose an answer --
a. Experiment A: Scores from no-treatment group: 2, 4, 6, 8, 10; scores from treatment group: 3, 5, 7, 9, 11.
b. Experiment B: Scores from no-treatment group: 2, 3, 4, 5, 6; scores from treatment group: 6, 7, 8, 9, 10.
2. The bigger the _______, the more likely that the treatment had a statistically significant effect.
-- Choose an answer --
a. Between-groups variability
b. Within-groups variability
3. _______ is sometimes called error variance.
-- Choose an answer --
a. Between-groups variance
b. Within-groups variance
4. In which experiment, are the results most likely to be statistically significant?
-- Choose an answer --
a. Experiment A: Scores from no-treatment group: 2, 4, 6, 8, 10; scores from treatment group: 3, 5, 7, 9, 11.
b. Experiment B: Scores from no-treatment group: 2, 3, 4, 5, 6; scores from treatment group: 3, 4, 5, 6, 7.
5. Between-groups variance is a pure measure of treatment effects.
-- Choose an answer --
a. True
b. False
6. Within-groups variance is a measure of random error that is uncontaminated by treatment effects.
-- Choose an answer --
a. True
b. False
7. If the treatment has no effect, treatment variance will be zero.
-- Choose an answer --
a. True
b. False
8. If you perform 15 t tests at the .05 level, your chances of making at least one Type 1 error would be closest to
-- Choose an answer --
a. .05
b. .50
9. In an ANOVA, you subtract within-groups variance from between-groups variance.
-- Choose an answer --
a. True
b. False
10. If the numerator of your F test is 4, you have four groups.
-- Choose an answer --
a. True
b. False
11. If F (4, 12) = 16.00, p < .05 for a study that had one treatment variable, the results were based on scores from
-- Choose an answer --
a. 16 participants
b. 17 participants
12. A statistically significant F in a multiple group ANOVA tells you neither that the effect is large nor which groups differ from each other.
-- Choose an answer --
a. True
b. False
13. For which experiment can you conduct a post hoc trend analysis?
-- Choose an answer --
a. An experiment that used four levels of treatment (5, 15, 30, and 40 rewards per hour)
b. An experiment that used three levels of treatment (0, 10, and 20 rewards per hour)
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