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It has been postulated that a student is more likely to smoke marijuana if both parents...

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Basic Math

It has been postulated that a student is more likely to smokemarijuana if both parents use alcohol and drugs. A paper publishedin Youth and Society (1979) reported that among 570 students whoseparents use alcohol and drugs, 320 regularly smoke marijuana.

a. Is there any evidence that a student is more likelyto smoke marijuana if both parents use alcohol and drugs?

b. Joann is planning for a new study on this problem.Suppose no prior information is available, what is the minimumsample size required such that the length of the 92.32% confidenceinterval for the true proportion of students smoke marijuana ifboth parents use alcohol and drugs is at most 0.075?

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