Week 7 Quiz

True or False: While it is common to report the result of an ANOVA, researchers rarely report the results of a post hoc test.

False

Which of the following designs are associated with greater power to detect an effect, particularly when there is consistent participant responding between groups? a. within-subjects design b. between-subjects design c. none of the above

a. within-subjects design

A researcher conducts two studies on child health. In Study 1, 30 children consume either a low-, moderate-, or high-fat meal (n = 10 per group). In Study 2, the researcher conducts the same study, except that a No Meal control group is added, with n = 10 in each group. If Fobt = 3.11 in both studies, then in which study will the decision be to reject the null hypothesis at a .05 level of significance for a one-way between-subjects ANOVA? a. Study 1 b. Study 2 c. both d. none

b. Study 2

A researcher conducts two studies using the one-way between-subjects ANOVA. The sum of squares between groups is smaller in Study 1 than in Study 2; the sum of squares total is the same in both studies. Using η2, in which study will the effect size be larger? a. Study 1 b. Study 2 c. there is not enough information to answer this question

b. Study 2

A sex therapist has adult female clients rate their level of interest in each of six relationship situations. To analyze differences in the ratings, what type of statistical design is appropriate for this study? a. a related-samples t test b. a one-way within-subjects ANOVA c. a one-way between-subjects ANOVA d. none of these

b. a one-way within-subjects ANOVA

Using a within-subjects ANOVA design, ______. a. n ⋅ k participants are each observed one time b. n participants are observed k times c. different participants are observed in each group d. all of these

b. n participants are observed k times

The term "between-subjects" refers to ______. a. observing the same participants in each group b. observing different participants one time in each group c. the type of post hoc test conducted d. the type of effect size estimate measured

b. observing different participants one time in each group

A researcher recorded the shooting percentage of 28 professional basketball players in each of four quarters in a game. What are the degrees of freedom error for a one-way within-subjects ANOVA? a. 3 b. 27 c. 81 d. there is not enough information to answer this question

c. 81

A researcher divides participants into groups that will engage in low, moderate, or intense levels of exercise. The total calories consumed by participants following the exercise are then recorded. What type of statistical design is appropriate for this study? a. a related-samples t test b. a two-independent-sample t test c. a one-way between-subjects ANOVA d. a two-independent-sample t test and a one-way between-subjects ANOVA

c. a one-way between-subjects ANOVA

Post hoc tests are computed ______. a. prior to conducting a hypothesis test b. to determine which set of degrees of freedom can be attributed to the variability between groups c. following a significant ANOVA test to make pairwise comparisons d. to determine if group means differ, even for tests in which the decision is to retain the null hypothesis

c. following a significant ANOVA test to make pairwise comparisons

"Within subjects" is also called ______. a. between subjects b. within groups c. repeated measures d. random sampling

c. repeated measures

A Bonferroni test controls for ______. a. experimentwise alpha b. lengthwise alpha c. testwise alpha d. not-so-wise alpha

c. testwise alpha

The following results are reported for a one-way within-subjects ANOVA: F(2, 27) = 3.55, p < .05 (η2/p= -.14). Which value in the summary cannot be correct? a. the test statistic b. the p value c. the effect size d. the degrees of freedom

c. the effect size

The degrees of freedom for error is called ______. a. degrees of freedom error b. degrees of freedom denominator c. degrees of freedom within groups d. all of these

d. all of these

Which of the following is a source of variation that is measured using the one-way within-subjects ANOVA? a. between-groups variation b. within-groups variation c. between-persons variation d. all of these

d. all of these