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?

For between subjects designs, randomization and matching techniques are used in an attempt to

Rejection of the overall null hypothesis indicates that

If the null hypothesis is false and we reject the null hypothesis, we have made a:

A 2 × 2 factorial experiment contains ____ simple main effects.

Using multiple t tests rather than an F test with a five group experiment would

An F test is based on the idea that, if the null hypothesis is true, the top part of the F ratio tends to be

c. What is the overall main effect of Therapist Personality (Dr. Phil vs. other therapist) on well-being?

Within group variability is caused by which of the following?

In the above figure, the pattern of results indicates (hint: the distances are a little off in the diagram, answer the question as if the * at A2 is below the o at A2 … in other words, connecting the symbols would result in PARALLEL LINES)