Which of the following assumptions is NOT required to conduct an ANOVA test?
The populations have the same variance for the variable of interest
The populations are normally distributed for the variable of interest
Each value is sampled independently from each other value for the variable of interest
The populations have the same mean for the variable of interest

Which of the following descriptions of a main effect is correct?
A main effect of an independent variable is the effect of the variable averaging over the levels of the other variable(s)
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 must not have any effects for all levels of all of the independent variables
A main effect of an independent variable must have effect over at least one level of all other variables

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?
11
12
9
20
10

When different subjects are used for the levels of a factor, the factor is called a____; when the same subjects are used for the levels of a factor, the factor is called a___.
within-subjects factor; Between-subjects factor
Between-subjects factor; Within-subjects factor
Inter-subjects factor; repeated measures factor
Repeated measures factor; inter-subject factor

Imagine an experiment with 10 groups and within each group there are 25 participants. How many degrees of freedom are there for the within subject factor?
250
2.5
240
0.4
120

Which of the following is correct?
An ANOVA conducted on a design in which there is only one factor is called a one-way ANOVA
An ANOVA conducted on a design in which there is only one level is called a one-way ANOVA
The factors in an ANOVA test are the dependent variables
We can only have within-subject factor; it is impossible to have between-subject factor

Which of the following description of ANOVA is correct (select only one)?
ANOVA is used to compare two or more means
ANOVA can only compare means between two groups
You can only use ANOVA test before Tukey hsd test
The null hypothesis of ANOVA test is that means of all groups are not equal.

When different subjects are used for the levels of a factor, the factor is called a____.
Within-subjects factor
Inter-subject factor
Between subjects factor
Repeated measures factor