A variable that precedes an outcome of interest and decreases the chances that the negative outcome will occur is a(n) ____
a. predictive factor
b. risk factor
c. epidemiological factor
d. protective factor
d
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The length of time from the beginning of labor to the birth of the baby is
a. about the same for most women. b. shorter for first births than later births. c. highly variable from woman to woman. d. shorter in the United States than in developing countries.
Which of the following is a measure of variability?
A. mean B. variance C. standard deviation D. variance and standard deviation
In a survey of 186 societies, what percent of older children reported being principal caregivers to younger siblings?
a. 57% b. 23% c. 85% d. 5%
What is the intensity level of a stimulus that a person will detect 50% of the time called?
a. perception b. absolute difference c. absolute threshold d. sensation