A researcher tests groups of high, medium and low anxiety participants who have been permitted either low sleep or normal sleep before learning and being tested on a memory list of 15, 20, 30 or 45 items.
-4) In the design described above the degrees of freedom associated with the memory x sleep interaction will be:

Question

Quizplus · Accepted Answer

The degrees of freedom for an interaction in a factorial design are calculated by multiplying the degrees of freedom of each factor involved in the interaction. For the memory list factor, there are 4 levels (15, 20, 30, 45 items), so its degrees of freedom are 3 (4-1). For the sleep factor, there are 2 levels (low sleep, normal sleep), so its degrees of freedom are 1 (2-1). Therefore, the degrees of freedom for the memory x sleep interaction are 3 * 1 = 3.

A Researcher Tests Groups of High, Medium and Low Anxiety