Studies of fertility among the hunting and gathering populations, the French Canadian settlers, and the Irish indicate that __________
a. societies were able to adjust birth rates to adapt to the social and economic environment in which they existed
b. these populations had lower life expectancies, because lack of birth-spacing led to poverty and famine
c. when population density was low, more land could be devoted to agriculture, and enough food could be grown to eliminate famine
d. societies were not able to make adjustments to birth rates or mortality rates
D
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The coefficient of determination is computed by
A) Squaring the correlation coefficient. B) Dividing correlation coefficient by two. C) Doubling the correlation coefficient. D) Taking the square root of the correlation coefficient.
Which of the following is true in psychological research?
A) The independent variable is usually a response variable. B) Assigned independent variables are usually stimulus variables. C) Manipulated independent variables are usually organismic variables. D) The dependent variable is usually a behavioral variable.
Validity is evaluated in terms of
A) the repeatability of a measure. B) the ability of a measure to predict other variables. C) the number of times a variable is measured. D) the clarity of the measure.