Question

445 college students were classified according to both frequency of marijuana use and parental use of alcohol and psychoactive drugs (from the article \marijuana use in college\, youth and society, 1979: 323 - 334). the data are represented in the contingency table shown below.

parental usage	student usage level
both		17	11	19	47
neither		141	54	40	235
one		68	44	51	163
total		226	109	110	445

which of the following is the marginal distribution for student usage level?

○ never = 17/445, occasional = 11/445, regular = 19/445
○ never = 110/445, occasional = 54/445, regular = 226/445
○ never = 226/445, occasional = 109/445, regular = 110/445
○ never = 141/226, occasional = 54/109, regular = 40/110

Explanation:

Step1: Identify total students

Total students = 445

Step2: Find marginal totals for student usage

Never = 226, Occasional = 109, Regular = 110

Step3: Calculate marginal distribution

Never = 226/445, Occasional = 109/445, Regular = 110/445

Answer:

Never = 226/445, Occasional = 109/445, Regular = 110/445