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. The main purpose of the t test is to determine whether the difference between two groups is larger than what would be expected by random error alone.
-- Choose an answer --
a. True
b. False
2. If the df for the t test is 12, the number of scores analyzed was
-- Choose an answer --
a. 10
b. 14
3. If df = 14, t < .05, and p > .05, the results were statistically significant.
-- Choose an answer --
a. True
b. False
4. If df = 14, t = 5, p < .05, experimental group mean = 11, and control group mean = 1, the bottom (denominator) of the t ratio would be
-- Choose an answer --
a. 2
b. 5
5. If df = 140, t = 5, p < .05, experimental group mean = 11, and control group mean = 10, the effect size would be small.
-- Choose an answer --
a. True
b. False
6. A t test should be used if your dependent measure is ordinal (e.g., 1 = first person to finish exam, 2= second person to finish exam, 3= third person to finish exam).
-- Choose an answer --
a. True
b. False
7. If your experimental group members become an interacting group, the results of a t test on data from your simple experiment will
-- Choose an answer --
a. Not be valid
b. Be valid
8. Which of the following would be a more serious problem?
-- Choose an answer --
a. Conducting a t test on scores that were not independent
b. Conducting a t test to compare two groups that had unequal variances
9. If you did a t test and your scores were not normally distributed, you would be most concerned if
-- Choose an answer --
a. You had fewer than 30 participants in each group
b. You had more than 30 participants in each group
10. The reliability of a measure would be most likely to be called into question when the research
-- Choose an answer --
a. Did not obtain significant results
b. Obtained significant results
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