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)

To test to see if the functional relationship between two variables is “u”-shaped, you need at least ____ levels of the independent variable.

Internal validity refers to the soundness of the conclusion that:

In the above figure, the pattern of results indicates (hint:  if you connect the lines, they should form a “perfect” V on its side)

c. By examining the scores and group means in the previous question, identify which experiment is more likely to find significant differences between the groups (i.e. to yield a significant F-value). Experiment A or Experiment B?