A research study showed that 7 percent of “A” students smoke, while nearly 50 percent of “D” students do. (a) List in rank order six factors that you think affect grades. Is smoking on your list? (b) If smoking is not a likely cause of poor grades, can you suggest reasons why these results were observed? (c) Assuming these statistics are correct, would “D” students who give up smoking improve their grades?
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