A Morgan Stanley Consumer Research Survey sampled men and women
A Morgan Stanley Consumer Research Survey sampled men and women and asked each whether they preferred to drink plain bottled water or a sports drink such as Gatorade or Propel Fitness water (The Atlanta Journal-Constitution, December 28, 2005). Suppose 200 men and 200 women participated in the study, and 280 reported they preferred plain bottled water. Of the group preferring a sports drink, 80 were men and 40 were women.
Let
M = the event the consumer is a man
W = the event the consumer is a woman
B = the event the consumer preferred plain bottled water
S = the event the consumer preferred sports drink
a. What is the probability a person in the study preferred plain bottled water?
b. What is the probability a person in the study preferred a sports drink?
c. What are the conditional probabilities P(M | S) and P(W | S) ?
d. What are the joint probabilities P(M ∩ S) and P(W ∩ S)?
e. Given a consumer is a man, what is the probability he will prefer a sports drink?
f. Given a consumer is a woman, what is the probability she will prefer a sports drink?
g. Is preference for a sports drink independent of whether
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