In a study of the effect of handedness on athletic ability, participants were divided into three groups: right-handed, left-handed, and ambidextrous. Athletic ability was measured on a 12-point scale. The independent variable is _________; the number of levels of the independent variable is _______.   1.  athletic ability; twelve   2.  athletic ability; three   3.  handedness; three   4.  handedness; twelve

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