<p>Yan was studying the effects of diet cola on tooth decay. He compared the rat

Question

<p>Yan was studying the effects of diet cola on tooth decay. He compared the rate of tooth decay in a group of people who consumed diet cola to the rate of tooth decay in a group of non-consumers who otherwise had similar diets and life-styles. In this investigation which is the independent variable?</p>
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<td>A. The consumers.</td>
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<td>B. Tooth decay.</td>
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<td>C. The similarity of the diets.</td>
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<td>D. Diet cola.</td>
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<td>E. The non-consumers.</td>
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Explanation / Answer

The independent variable is the sample of people who do not consume diet cola. Since you are studying the effects of diet cola and tooth decay, the non-consumers of diet cola would be independent of the study.

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