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 _______. A) athletic ability three B) athletic ability twelve C) handedness three D) handedness twelve.

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The independent variable is "handedness" because it is the variable that is being manipulated or categorized (right-handed, left-handed, ambidextrous) to see its effect on athletic ability, which is the dependent variable. There are three levels of the independent variable: right-handed, left-handed, and ambidextrous.

In a Study of the Effect of Handedness on Athletic