(normal curve) a symmetrical, bell-shaped curve that describes the distribution of many types of data; most scores fall near the mean (68% fall within one standard deviation of it) and fewer and fewer near the extremes
A. Normal distribution curve
B. Random sample
C. Distribution curve
D. Observer bias
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in an experiment, the group that is exposed to the treatment, that is, to one version of the independent variable
A. Statistical significance
B. Experimental group
C. Inferential statistics
D. Measure of central tendency
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