You should become adept at looking at a graph and determining whether or not there are interactions or main effects. For two factors, there are eight possible results. The following graphs illustrate those possibilities. In each case the factors are referred to as Group and Condition, with Condition plotted on the horizontal axis. In these graphs assume that differences less than 1 full point are merely random error. Assume all cell sizes have similar sample sizes. Select all statistically significant sources of variation.

A) Nothing is significant

B) Condition

C) Group

D) Interaction

1)

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