All of the following are common sources of infertility except _______
a. low sperm count
b. age of mother
c. a history of having twins
d. damage to the mother’s reproductive organs
Answer: C
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A psychologist wants to identify people who are likely to develop schizophrenia. Which variables would be the best choices to help in identifying individuals who are prone to developing schizophrenia?
a) perception, memory, and problem solving b) blood pressure, heart rate, and respiration levels c) physical strength, reaction time, and visual acuity d) blood oxygen level, history of alcohol use, and caffeine use
Derrill is worried that variables such as age, gender, personality characteristics, and education level might confound the results of his experiment, which is designed to test the effects of mood on reaction time. Derrill should use ____ assignment to experimental groups to distribute the impact of these ____ variables.?
a. ?random; representative b. ?representative; random c. ?representative; representative d. ?random; random