Capella PSYC4700 Week 7 Quiz Latest 2023

PSYC4700 - Stat for Behavioral Sciences

Week 7 Quiz 1

Question 1

For an analysis of variance, the term "one-way" refers to ______.                                          

a. the number of ways that the data can be analyzed

b. the number of statistical tests in the design

c. the number of factors in the design

d. the direction that the traffic should follow on a road

Question 2

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

Question 3

A professor compared differences in class grades between students in their freshman, sophomore, junior, and senior years of college. If different participants were in each group, then what type of statistical design is appropriate for this study?                                 

a. a two-independent-sample t test

 b. a one-way between-subjects ANOVA

c. a two-way between-subjects ANOVA

d. a two-independent-sample t test and a one-way between-subjects ANOVA

Question 4

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 F obt = 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

Question 5

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

Question 6

The sum of squares between groups is larger in Study 1 than in Study 2; the sum of squares total is smaller in Study 1 than in Study 2. Using η 2 , 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

Question 7

The following is a summary of a one-way between-subjects ANOVA: F(2, 37) = 3.42, p < .05, η 2 = .12. How many participants were observed in this study?                                            

a. 12

b. 37

 c. 40

d. 39

Question 8

The term "within-subjects" refers to ______.                                   

a. observing the same participants in each group

b. observing different participants in each group

c. the type of post hoc test conducted

d. the type of effect size estimate measured

Question 9

A researcher observed the mating behavior of 10 porpoises in five different social conditions. What are the degrees of freedom between groups for a one-way within-subjects ANOVA?                                          

a. 4

b. 9

c. 27

d. there is not enough information to answer this question

Question 10

Which of the following is an assumption for computing a one-way within-subjects ANOVA?                       

a. The population being sampled from is positively skewed.

b. Different participants were observed in each group.

c. Independent observations were made within groups, but not between groups.

d. All of these.

Question 11

A researcher measures anxiety levels among participants in the presence and absence of a fearful stimulus. If the same participants are observed in each group, then what type of statistical design is appropriate for this study?                                           

a. a related-samples t test

 b. a related-samples t test and a one-way within-subjects ANOVA

c. a one-way within-subjects ANOVA

d. a one-way between-subjects ANOVA

Question 12

Which of the following is an assumption for the one-way within-subjects ANOVA, but not for the one-way between-subjects ANOVA?                                           

a. normality

b. homogeneity of variance

 c. homogeneity of covariance

d. none of these; each is assumed for both tests

Question 13

A Bonferroni test controls for ______.                                 

a. experimentwise alpha

b. lengthwise alpha

 c. testwise alpha

d. not-so-wise alpha

Question 14

For the one-way within-subjects ANOVA, the more ______ participant responding between groups, the less powerful the test will be at detecting an effect.                                           

a. consistent

 b. inconsistent

c. efficient

d. inefficient

Question 15

The following results are reported for a one-way within-subjects ANOVA: F(2, 27) = 3.20, p < .05 (η 2/p = .14). Which value in the summary suggests that the design was within subjects?                                  

a. the test statistic value

b. the degrees of freedom

c. the p value

 d. the partial estimate for η2