Question 1: If a study has 3 groups of 25 subjects each, the degrees of freedom are 2 and 24.
a. True.
b. False.
Question 2: It is possible for all paired means to be statistically significant.
a. True.
b. False.
Question 3: An ANOVA with one independent variable but four groups is known as a one-way ANOVA.
a. True.
b. False.
Question 4: If the overall F is statistically significant, at least one pair of means must also be statistically significant.
a. True.
b. False.
Question 5: The sum of within-groups variance and between-group variance is the total variance.
a. True.
b. False.
Question 6: One way means that
a. There is only one correct way to calculate the test statistic.
b. The results can be in only one direction.
c. There is only one sample (group) in the study.
d. There is only one IV in the study.
Question 7: When the null hypothesis is true, the calculated F should be close to
a. 0.
b. 1.
c. Infinity.
d. There is not enough information to tell.
Question 8: You conduct an ANOVA at the .05 error level and find a significant F. You conduct a Tukey HSD post hoc test on the same data at the same .05 error level and find no significant difference between the particular groups. From this you know that
a. The sample size in each group was not sufficient to pick up the effect detected by the F test.
b. The variation within each group masked the variation between the groups.
c. You should have conducted your Tukey HSD at the .01 error level.
d. You have made a calculation error in either the F test or the Tukey HSD.
Question 9: Assume that the group means in a study are as follows:
Group 1 = 20.
Group 2 = 18.
Group 3 = 37.
If the Tukey HSD critical value is 18, what can you say about the location of the significant difference between the groups?
a. It lies between Groups 1 and 2 only.
b. It lies between Group 1 and 3 only.
c. It lies between Groups 2 and 3 only.
d. There is no statistical significance between the Groups.
Question 10: An F table shows the following two critical values: 2.96 and 4.60. Which of these values would be the critical value for a 0.01 error level?
a. 2.96.
b. 4.60.
c. There is not enough information to tell.