The best research design to distinguish among age, period, and cohort effects is:
A. participant observation.
B. secondary data.
C. cross-sectional.
D. longitudinal.
Answer: D
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In the northeast United States, some lakes which were once considered good fishing spots no longer have fish living in them. The reason fish cannot survive in these lakes is because ________
A) of the greenhouse effect B) the burning of fossil fuels produces acid rain C) of global warming D) of the depletion of the ozone layer
Compared with younger adults, older adults' metabolism of medication
a. takes more time. b. takes less time. c. takes the same amount of time. d. requires more medication to achieve the same levels in the blood stream.
What is the median?
a. 6 b. 7 c. 8 d. 9
The family is a key social institution.
Answer the following statement true (T) or false (F)