Exercise 14: Test for an interaction in some ridiculously artificial, but nice and simple, data

Download this data file. Look at the Variable View to see details. These data simulate common reading studies used in cognitive psychology. Use multiple regression to test the interaction. (Remember you have to center a continuous variable before building the interaction term.) Whether you get a significant interaction or not, please decompose the interaction. To do this, create a categorical set of variables to conveniently graph the outcome variable.

Important: Write all the above in brief statements in APA format. Do not rush through the exercise and ensure you have everything understood and completed. Slides are available from the home page. Send answers to psyc7302@gmail.com with subject line "EXERCISE 14". Feel free to make use of so-called "Rick Dale" to get questions answered, confusion unknotted, and the mysteries of life unveiled.