The problem of selection refers to the fact that _____
a. people may compare the performance of the subjects with the norm for performance on that variable in the general population
b. people select themselves when they volunteer for an experiment
c. people de-select themselves when they fail to complete the study
d. both b and c
A
Even in studies in which there is no actual control group, people have a tendency to compare the performance of the subjects with what is normal for the society as a whole.
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The maternal age range of peak fertility and peak newborn survival has always been
16–24 years. 18–25 years. 20–26 years. 22–28 years.
A group of scientists is attempting to verify recent data published on the chemical composition of tears and the presence of Alzheimer's disease. This illustrates the critical thinking principle of
A) ruling out rival hypotheses. B) falsifiability. C) replicability. D) Occam's Razor.