A psychologist examines the effect of a new therapy by first assessing patients' symptoms using a pretest,then administering eight weeks of therapy,and then administering a posttest.Based on this research design,the psychologists will be able to
A)make a causal claim about whether the treatment is effective.
B)make a claim about the applicability of the treatment to other potential patients.
C)neither (A)nor (B)
D)both (A)and (B)

Question

Quizplus · Accepted Answer

This design lacks a control group, so it cannot establish causality (A), and without a diverse sample or replication, it cannot generalize to other patients (B).

A Psychologist Examines the Effect of a New Therapy by First