What is statistical significance?
a) A criterion used to determine the level of confidence of two groups differing at levels greater than chance
b) A criterion used to determine the level of confidence of the null hypothesis being false
c) The practical value or importance of the effect of an intervention
d) A method for expressing differences between groups in a common metric
Correct Answer: a
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According to research by Victoria Molfese and her colleagues, _________ was the single most important predictor of scores on IQ tests among children age 3 to 8
a. parent IQ c. the quality of schools b. the home environment d. the children's IQ scores at age 2
Mikulincer, based on his study of the conditions under which learned helplessness or reactance occurs, has found that:
a. only reactance occurs b. only learned helplessness occurs c. neither reactance nor learned helplessness occurred under the conditions he studied d. both reactance and learned helplessness occurred depending upon conditions
If a score in a distribution changes in numerical value, it will necessary change the ______.
A. range B. interquartile range C. standard deviation D. all of the measures of variability
Behavior will be most efficient when arousal is
A) high B) low C) medium D) either high or low