Unit 6: Mixed Design ANOVA This week's assignment requires you to complete a mixed design analysis. The

Unit 6: Mixed Design ANOVA

This week's assignment requires you to complete a mixed design analysis. The data is a subset of a theoretical experiment in which the researcher hypothesized that engineering students would have a more developed sense of shape and symmetry than do psychology students. Three types of shapes were presented to samples of psychology and engineering students under sub-optimal viewing conditions on a monitor screen. All three shapes were presented to each subject and the order of presentation was counterbalanced. The dependent variable is the number of shapes correctly identified. See the unit 6 datafile for all the data needed for this activity.

SPSS Hints

At this point in the course, you should be able to get SPSS to run the appropriate analyses without help, but here are a few tips:

Select Analyze / GLM / Repeated Measures .
The within-subjects factor will be identified as "shape" and it has three levels. Press Add .
Then select Define and move these three within-subjects variables ( Triangle, Square, and Rectangle ) over from the left side box to the Within-Subjects Variables box.
Move the remaining variable category (the between-subjects factor with two groups) over to the Between-Subjects Factors box.
Select the Plots option, identify Category as the horizontal axis, and shape to separate lines.
For post-hoc, select Category and Bonferonni.
For options, select whatever marginal means you would like to see.