2. Each individual in a random sample of 1349 high school and college students (from a research report) was cross-classified with respect to both political views and marijuana usage, resulting in the data displayed in the accompanying two- way table. (a) Given that a randomly selected student never used marijuana, what is the probability that he/she is a conservative? (b) What is the probability that a randomly selected student frequently uses marijuana or he/she is a liberal. (c) Computing conditional probabilities within each column, does the data sup- port the hypothesis that political views and marijuana usage level are indepen- dent within the population? Usage Level Political Views Never Rarely Liberal 479 173 Conservative 214 47 Other 172 45 Frequently 119 15 85

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