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It has been hypothesized that overall academic success for college freshmen as measured by grade point average (GPA) is a function of IQ scores , hours spent studying each week
, and one's high school average
. Suppose the regression equation is:
. The multiple standard error is 6.313 and R2 = 0.826.
Which independent variable has the smallest affect on GPA?
Intervention Group
A group in a scientific study that receives the treatment or intervention being tested, as opposed to a control group which does not.
Control Group
A group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.
Masking
A method used in research where the participants and/or researchers are unaware of which individuals are in the control group and which are in the experimental group, to prevent bias.
Confounding
A situation in which the effect of two variables on a third is not clearly distinguishable.
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