For men who are age 75-84, the most common marital status is ; for women in the age range the most common marital status is

The technique for assuring that subjects in the experimental and control groups are

as similar as possible, even on attributes that the experimenter has not even thought of, is (a) random assignment of subjects to groups (b) random sampling of subjects (c) assigning subjects to groups in turn, so that the first subject who shows up is put in one group, the second into the other, etc. (d) sampling of situations

If a test is marketed as an IQ test but when it is used properly it does not predict

success in school, on the job, or anywhere else, then that test might be (a) reliable (b) valid (c) objective (d) A and/or C, but not B