A Clinical Psychologist Is Interested in Comparing the Effectiveness of Short

question 154

Multiple Choice

A clinical psychologist is interested in comparing the effectiveness of short term relaxation and cognitive-behavioral therapy in treating mild depression. An experiment is conducted in which 15 patients with mild depression are randomly selected and assigned 5 each to a relaxation therapy group, a cognitive/behavioral therapy group, and an attention placebo group. Therapy is administered until the patient is judged no longer depressed or until 10 treatment sessions have elapsed. The following data is obtained. Scores are the number of sessions for each patient. Using a = .05, what do you conclude?

• A) retain H 0 ; we cannot conclude the two therapies differ in effectiveness
• B) reject H 0 ; the two therapies appear to differ in effectiveness
• C) retain H 0 ; the two therapies have the same effectiveness
• D) reject H 0 ; the two therapies are not significantly different
• E) a and c

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Definitions:

Negative Externalities

Unintended and uncompensated costs imposed by one party's actions on others not involved in the transaction.

Efficiency Loss

The loss of economic efficiency that can occur when the balance between supply and demand is not achieved, leading to potential welfare loss.

Deadweight Loss

See efficiency loss.

Marginal Cost

The increase in expenditure incurred from making one more unit of a product or service.