Question

a therapist is studying the effects of meditation and yoga on reducing stress. he offers the treatments to a random sample of 30 of his patients and lets them choose which treatment they want to use. which of the following statements is not true about this experiment? the therapist let the patients choose the treatment; therefore, he will not be able to tell which treatment is more effective. the therapist used a random sample of 30 of his patients; therefore, he will be able to tell which treatment is more effective, yoga or meditation, in reducing stress. the therapist did not use random assignment; therefore, the variability between the patients is not evened out, and he will not be able to tell which treatment is more effective. the therapist used a random sample; however, the patients may choose which treatment they prefer, and their stress would be reduced due to their preference instead of the treatment.

Explanation:

Answer:

The therapist used a random sample of 30 of his patients; therefore, he will be able to tell which treatment is more effective, yoga or meditation, in reducing stress.