Question 1 A _____of a variable is the effect of the variable at a single level of another variable.

Student Answer: Main effectSimple effect Interaction Levels

Question 2) Which of the following descriptions of a main effect is correct?

Student Answer: A main effect of an independent variable must have effect over at least

one level of all other variables A main effect of an independent variable must not have any effects for all levels of all of the independent variables A main effect of a variable is the effect of the variable at a single level of another variable A main effect of an independent variable is the effect of the variable averaging over the levels of the other variable(s)

Question 3) Imagine a researcher wanted to know the effect of gender and education on wages. He

sampled men and women with 9 years education, 12 years of education, and 16 years of education. If he conducted an ANOVA test to see if there were differences in mean wages from different gender and education levels, what was his factorial design? Student Answer: Gender(2) X Education (3) Gender (2) X Education (2) Gender (1) X Education (2) Gender (3) X Education (3)

Question 4) Imagine an experiment with 20 groups, and within each group, there are 50 participants.

How many degrees of freedom are there for the within subjects factor? 980 100 30 2.5 49

Question 5) Which of the following are correct? Student Answer: An ANOVA test can compare

the means with each other The alternative hypothesis of an ANOVA test is that all of the means are significantly different from each other You can use ANOVA test to compare a control group with the average of other three groups. An interaction term makes it hard to explain main effect in an ANOVA test

Question 6) Imagine an experiment with 9 groups, and within each group, there are 34 participants.

How many degrees of freedom are there for the between subjects factor? Student Answer: 3.7 25 11 8 9

Question 7) In a two-factor ANOVA test, if one variable has 8 levels and the other has 3 levels, how

many degrees of freedom are there for the interaction? Student Answer 11 14 2.67 22 10

Question 8) he ____of an independent variable is the effect of the variable averaging over the levels of

the other variable(s). Student Answer: Simple Effect Main effect Interaction Levels

Question 9)In a two-factor ANOVA test, if one variable has 10 levels and the other has 9 levels, how

many degrees of freedom are there for the interaction? Student Answer: 72 18 88 90 21

Question 10) In a two-factor ANOVA test, if one variable has 5 levels and the other has 4 levels, how

many degrees of freedom are there for the interaction? Student Answer: 9 8 12 11 1