When computing the variance, why do we square the deviations from the mean?
a. To return the units of measure to their original form
b. To compensate for the fact that the number of degrees of freedom is different from N
c. To transform the raw scores into squared scores
d. To compensate for the fact deviations about the mean always sum to zero
d
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Differential history effects are a threat to internal validity for which of the following designs?
a. differential research design b. one-group pretest–posttest design c. pretest-posttest nonequivalent control group design d. longitudinal design
Which response to stress is MORE associated with females than males?
a. fight or flight b. tend and befriend c. grab and jab d. meet and greet
What is the average weight of babies at birth in developed countries?
a. 5 pounds b. 7.5 pounds c. 10 pounds d. 12.5 pounds
Which statement on parent-infant early relationships is true?
A. Mothers tend to spend more time reading to infants. B. Infants are biologically programmed to attach to mothers. C. Mothers provide better early childcare than fathers. D. When in distress, infants prefer to interact with fathers.