Items #1-7: Choose the alternative that best completes the sentence or answers the question.
1. In ANOVA, the term “factor” refers to
A. a dependent variable
B. an independent variable
C. a treatment mean
D. error
2. Within a single one-way between subjects ANOVA, the critical value of q changes from comparison to comparison in the
a. Tukey’s HSD post hoc test
b. Student Newman-Keuls post hoc test
c. Scheffe test
3. In multiple regression in order to maximize the prediction of the criterion variable (Y), we should select predictor variables (Xs) that have correlations with Y but have correlations with each other.
A. low, high
B. low, low
C. high, low
D. high high
4. Which of the following is a design requirement of a between-subjects factorial ANOVA?
A. There are two or more independent variables.
B. Participants are assigned to every level of both independent variables.
C. A covariate is measured prior to implementation of the intervention.
D. There is one independent variable and participants are assigned to only one group.
5. A planned orthogonal comparison was conducted with the three levels of the independent variable. The first comparison had the following weights:
Year Freshman Junior Senior
Weight -2 +1 +1
Which set of weights is orthogonal to the first comparison?
|
Freshman |
Junior |
Senior |
|
A. -1 |
0 |
+1 |
|
B. -1 |
+1 |
0 |
|
C. 0 |
-1 |
+1 |
|
D. 0 |
0 |
+1 |
6. A researcher reported the statistical results of a one-way between subjects ANOVA as F(2, 12) = 2.63, p > .05. What statistical decision was made?
A.reject H0
B.fail to reject H0
7. For ANCOVA, the researcher reported the covariate as F(1, 48), 56.29, p < .001, partial h2 = .54. What statistical decision regarding the covariate was made?
A.reject H0
B.fail to reject H0
Items #8-11: For each item, indicate if the statement is True (T) or False (F).
8. The repeated measures design includes some risk of carry-over effects, such as fatigue.
9. Post hoc tests would not be needed if the null hypothesis is rejected in a one-way between subjects ANOVA comparing two groups.
10. An ANOVA may be used the answer the following research question: Are there differences in political affiliation (democrat, republican, independent) among different grade levels (freshman, sophomore, junior-senior)?
11. A multiple regression may be used to answer the following research question: Among college sophomores, is there a relationship between college cumulative GPA and high school GPA, SAT-verbal, and SAT-quantitative?
Items # 12-16: Use the following to answer the items.
A counseling psychologist is interested in investigating differences in depression among individuals who have had Covid-19. More specifically, she wants to know if there are differences in depression two months after a positive Covid-19 test among adults, ages 40 to 50, who were asymptomatic, had mild symptoms, or had severe symptoms.
Research Question: Among adults ages, 40 to 50 who tested positive for Covid-19 two months earlier, are there differences in depression scores among those who were asymptomatic, had mild symptoms or had severe symptoms?
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