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A study showed that people who ate two carrots every day had significantly less cavities than those who never ate carrots. Which of the following statements are correct? I. The general health-consciousness of the two groups is a possible confounding variable. II. This study provides evidence that eating carrots helps reduce cavities. III. In the absence of a control group, nothing can be deduced from a study such as this.

User Jobalisk
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Answer:

The answer is number one

User Zumry Mohamed
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