Which of the following conditions is not an organic cause of delirium?

(n) ______ hypothesis predicts a directional effect, whereas a(n) ______ hypothesis predicts an effect in either direction.

a. one-tailed; two-tailed b. two-tailed; one-tailed c. null; alternative d. alternative; null

If one were studying the hypothesis that people with high levels of stress are more likely to get cancer and wanted to include a matched control group, that group would:

A. not have cancer. B. have low levels of stress. C. have high levels of stress. D. have cancer.