n-335 35 (153431.1 ont see 3. A crossover trial is planned to evaluate the impact of an educational intervention program to reduce alcohol consumption in patients determined to be at risk for alcohol problems. The pla is to measure alcohol consumption (the number of drinks on a typical drinking day) before the intervention and then again after participants complete the educational intervention program How many articipantswouldberequiredtoen urethata95%,confidencen terval for the mean- difference in the number of drinks is within 2 drinks of the true mean difference? Assume that the standard deviation of the difference in the mean number of drinks is 6.7 drinks. 乙 z- o P8. 172- 173 乙 43. Page 1 of1

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