(1) When looking at slide 7 and realizing which test we should complete, i realize that the one we use does not include looking at the interaction. I'm wondering, then, if we still need to do so because in slide 9 the second bullet says that we must interpret the interaction. So, do we still need to look at the interaction term even though it is not discussed in the type of test we are using for question number 1?
(2) In the hw you say that "if" we include figures...this doesn't say that we need to, but should we since it is mentioned in the instructions?
Thanks!
2 comments:
You always need to interpret the interaction because any of the relationships of your individual predictor variables will be dependent upon your interaction (unless there is no interaction for a particular predictor). Your interaction is always your highest order explanation of what is happening in the variance of your model. Once you understand the effect of the interaction, from there are you able to understand the effect of individual predictors on the outcome.
I'm not sure about this last one. I would say its always better to air on the side of including all your data than not.
It is entirely up to you whether you include a figure or not. Look at the method by which you evaluated your interaction effect. If that method would seem to be elucidated by using a figure, do so. If not, don't.
However, if you DO include a figure, pay very careful attention to the requirements in the publication manual for figures. SPSS output cut and pasted into a file does not an APA formatted figure make.
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