A statistical test is most likely to indicate significant results when the difference between the means is ____ and the within-groups variability for each both the control and experimental groups is ____.

Use analysis of variance rather than a t test whenever you are dealing with

If only chance is operating to influence your data, then the theoretically expected F ratio would be

In a graph of experimental results, the presence of an interaction is indicated by

Which design would have the least power?

In an experiment, the variable that is manipulated is the:

Lengthening the time between trials should reduce

e. Assuming that your friend wants to achieve the highest well-being possible, what recommendation would you make to your friend? (hint: if there is an interaction, be sure to note how “it depends”)

In a within-subjects design the order of treatments should be

Which of the following would be a drawback to running all members of the experimental group in a single morning session and all members of the control group in a single afternoon session?