refers to how spread apart the scores of the distribution are or how much the scores vary from each other. There are four major measures of variability, including the range, interquartile range variance, and standard deviation
A. Measure of central tendency
B. Measures of variation
C. Null hypothesis
D. Operational definitions
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in an experiment, the group that is not exposed to the treatment: contrast with the experimental group ad serves as a comparison for evaluation the effects of the treatment
A. Debrief
B. Experimental group
C. Control group
D. Inferential statistics
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