1. When constructing a graph for a possible interaction, each dot in the graph s
ID: 3221029 • Letter: 1
Question
1. When constructing a graph for a possible interaction, each dot in the graph should be based on the mean (or total) for (I KNOW THE ANSWER IS NOT C)
a) each subject
b) each group of subjects that receives the same combination of treatments
c) each group of subjects that receives the same treatment for on of the factors
d) all subjects
2. Given that the null hypothesis for interaction has been rejected, the corresponding graph of this interaction should contain two or more _____________ lines. (I KNOW THE ANSWER IS NOT D)
a) straight
b) dissimilar
c) nonparallel
d) intersecting
3. You needn't be too concerned about violations of assumptions for F tests in two-factor ANOVA, particularly if all group sizes are equal and each is (I KNOW THE ANSWER IS NOT D)
a) very small
b) small
c) fairly large
d) very large
Explanation / Answer
The interaction graphs are separated based on groups. There can be one or more factors. It gives the graph with the groups subjects that receive the same treatments. Therefore, answer is b) each group of subjects that receives the same combination of treatments.
If there appears an interaction effect in factors, then the lines are parallel. The alternate hypothesis states that there is interaction effect between factors. Therefore, the answer is c) non-parallel
Small sample sizes can increase vulnerability to assumption violations. And for very large samples sizes, F statistic is very conservative. Therefore the answer is c) fairly large.
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