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. Before the treatment is administered, the treatment and control groups could be considered two random samples from the same population.
-- Choose an answer --
a. True
b. False
2. Even if the treatment has no effect, the mean for the treatment group may be higher than the mean for the control group.
-- Choose an answer --
a. True
b. False
3. Within-groups variability is entirely due to random error.
-- Choose an answer --
a. True
b. False
4. By looking at the scores from the two experiments below, determine which experiment has greater between-group variability.
-- Choose an answer --
a. Experiment A: control group 2, 2, 2; experimental group 8, 8, 8
b. Experiment B: control group 0, 2, 4; experimental group 0, 4, 8
5. Studying homogeneous participants will reduce within-groups variability
-- Choose an answer --
a. True
b. False
6. Using reliable measures, standardized procedures, and homogeneous participants will reduce both within-groups variability and between-groups variability.
-- Choose an answer --
a. True
b. False
7. If the difference between the control group mean and the experimental group mean is zero, the results will not be statistically significant.
-- Choose an answer --
a. True
b. False
8. In two experiments, the treatment group scored four points higher than the control group. By looking at some randomly selected scores from the control group, which experiment is more likely to find that four-point difference statistically significant?
-- Choose an answer --
a. 2, 3, 3, 2, 4, 2
b. 0, 4, 0, 11, 0, 1
9. Which of the following experiments is more likely to obtain statistically significant results?
-- Choose an answer --
a. Experiment A, which has 10 participants in each group
b. Experiment B, which has 60 participants in each group
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