PSYC 355 - Quiz: Two-Factor Analysis of Variance
The quiz:
Covers the Learn material from Module 4: Week 4.
Contains 16 multiple-choice and true/false questions.
Is limited to 1 hour.
Allows 1 attempt.
Is worth 40 points.
Question 1
2.5 / 2.5 pts
In a two-factor analysis of variance, a main effect is defined as _____.
the mean differences among the levels of one factor
the mean differences among all treatment conditions
the mean difference between the two factors
the difference between the largest treatment mean and the smallest treatment mean
Question 2
2.5 / 2.5 pts
The results of a two-factor analysis of variance produce df = 1, 30 for the F-ratio for factor A,
and df = 2, 30 for the F-ratio for the AxB interaction. Based on this information, how many
levels of factor B were compared in the study?
1
2
3
Cannot be determined without additional information
Question 3
2.5 / 2.5 pts
A two-factor research study is used to evaluate the effectiveness of a new blood-pressure
medication. In this two-factor study, Factor A is medication versus no medication and factor B is
male versus female. The medicine is expected to reduce blood pressure for both males and
females, but it is expected to have a much greater effect for males. What pattern of results should
be obtained if the medication works as predicted?
A significant main effect for factor A (medication)
A significant interaction
A significant main effect for factor A and a significant interaction
None of these
Question 4
2.5 / 2.5 pts
What is the relationship among the separate F-ratios in a two-factor ANOVA?
They may have different df values, but they all have the same denominator.
They all have the same df values and they all have the same denominator.
They may have different df values and may have different denominators.
They all have the same df values, but they may have different denominators.
Question 5
2.5 / 2.5 pts
The results of a two-factor analysis of variance produce df = 2, 36 for the F-ratio for factor A
and df = 2, 36 for the F-ratio for factor B. What are the df values for the AxB interaction?
1, 36
2, 36
3, 36
4, 36
Question 6
2.5 / 2.5 pts
How many separate groups of participants would be needed for an independent-measures, two-
factor study with 3 levels of factor A and 4 levels of factor B?
3
4
7
12
Question 7
2.5 / 2.5 pts
A two-factor study with two levels of factor A and three levels of factor B uses a separate group
of n = 5 participants in each treatment condition. How many participants are needed for the
entire study?
5
10
25
30
Question 8
2.5 / 2.5 pts
For a research study with 2 levels of factor A, 3 levels of factor B, and n = 5 in each treatment
condition, what are the df values for the F-ratio evaluating the main effect for factor A?
1, 4
1, 24
1, 29
2, 29
Question 9
0 / 2.5 pts
The results from a two-factor analysis of variance show a significant main effect for factor A and
a significant main effect for factor B. Based on this information, what can you conclude about
the interaction?
There must be a significant interaction
There probably is a significant interaction
The interaction cannot be significant
You cannot make any conclusion about the significance of the interaction
Question 10
2.5 / 2.5 pts
In a two-factor experiment with 2 levels of factor A and 2 levels of factor B, three of the
treatment means are essentially identical and one is substantially different from the others. What
result(s) would be produced by this pattern of treatment means?
A main effect for factor A
A main effect for factor B
An interaction between A and B
The pattern would produce main effects for both A and B, and an interaction.
Question 11
2.5 / 2.5 pts
A two-factor analysis of variance with 2 levels of factor A and 3 levels of factor B involves six
separate hypothesis tests.
True
False
Question 12
2.5 / 2.5 pts
Whenever a two-factor experiment results in a significant interaction, you should be cautious
about interpreting the main effects because an interaction can distort, conceal, or exaggerate the
main effects of the individual factors.
True
False
Question 13
2.5 / 2.5 pts
A two-factor study compares 2 levels of factor A and 3 levels of factor B with a sample of n = 5
participants in each treatment condition. This study uses a total of 25 participants.
True
False
Question 14
2.5 / 2.5 pts
Obtaining a significant interaction means that both factors A and B have significant main effects.
True
False
Question 15
2.5 / 2.5 pts
A two-factor, independent-measures research study with 2 levels of factor A and 3 levels of
factor B with n = 10 participants in each treatment condition would require a total of 60
participants.
True
False
Question 16
2.5 / 2.5 pts
For a two-factor analysis of variance, the significance of any specific F-ratio is completely
independent of the significance of the other F-ratios.
True
False
