Researchers Have Conducted Hundreds of Studies Comparing the Effectiveness of the Major

question 449

Multiple Choice

Researchers have conducted hundreds of studies comparing the effectiveness of the major types of psychotherapy. When the results of those studies are combined and summarized, what overall conclusion emerges?

• A) There is little or no difference in the effectiveness of different psychotherapies.
• B) Traditional psychoanalysis is superior to all other forms of psychotherapy.
• C) Insight-oriented therapies are superior to all other forms of psychotherapy.
• D) Behavioral therapies are the least effective form of psychotherapy.

---

Definitions:

E(X)

The expected value of the random variable X, representing the mean or average value that X takes on.

E(Y)

The expected value of the random variable Y, representing the mean or average outcome of a set of possible values weighted by their probabilities.

Covariance

A measure that indicates the extent to which two variables change together.

Marginal Probability

The probability of a single event occurring without consideration of any other events.