A disorder that occurs when a particular gene is injured on the X chromosome that results in mild to moderate mental retardation is known as ___________ syndrome
a. Tay-Sachs c. sickle-cell anemia
b. Down d. fragile X
d
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______ samples are ones that are chosen, such that everyone in the population has a specific, predetermined chance of being selected at random for the sample.
A. Probability B. Random C. Quota D. Convenience
When researchers are interested in whether participants can provide consistent responses, which of the following are they concerned with?
A. accuracy B. validity C. reliability D. honesty
Piaget asserted that the transition between concrete operations and formal operations occurs
a. for fewer than half of all teenagers. b. quickly, within weeks. c. gradually, over an interval of several months. d. slowly, over an interval of years.
Male sex hormones are called __________, while female sex hormones are called _________
a) estrogens; androgens. b) androgens; estrogens. c) testosterone; estrogens. d) estrogens; testosterones.