7. A research group based in San Diego recently conducted a study to understand

Question

7. A research group based in San Diego recently conducted a study to understand alcohol and illicit drug use . The study randomly surveyed 100 individuals from a population of interest and tound that 10 in the sample reported both alcohol and drug use, 15 individuals reported drug, but not alcohol use, 15 reported alcohol, but not drug use, and remaining 30 reported no alcohol or drug use. Display the data an appropriate 2 x 2 table indicating alcohol and drug use status. a. Drug use Yes NO 5 50 I S

Explanation / Answer

a) P(D') = 45/70

b) P(A and D) = 10/70

c) P(A) = 25/70

P(D) = 25/70

P(A and D) = 10/70

d) P(D') = 1-P(D)

= 1-(25/70) = 45/70

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