1. Suppose that, from a population of 50 bank accounts, we want to take a random sample of 4 accounts in order to learn about the population.How many different random samples of 4 accounts are possible?

1. A large consumer goods company ran a television advertisement for one of its soap products.On the basis of a survey that was conducted, probabilities were assigned to the following events.

B = individual purchased the product

S = individual recalls seeing the advertisement

BS = individual purchased the product and recalls seeing the advertisement

The probabilities assigned were P(B) = .20, P(S) = .40, P(BS) = .12

• What is the probability of an individual's purchasing the product given that the individual recalls seeing the advertisement?
• Does seeing the advertisement increase the probability that the individual will purchase the product?

1. The percentage of adult users of the Internet who use Facebook has increased over time (Pew Research Internet Project, 2013).Of adult Internet users age 18-49, 81% use Facebook.Of adult Internet users age 50 and older, 54% use Facebook.Assume that 52% of adult Internet users are age 18-49.

What is the probability that a randomly selected adult user of the Internet is age 50 or older?

Given that an adult Internet user uses Facebook, what is the probability that he/she is age 18-49?

• A survey of magazine subscribers showed that 45.8% rented a car during the past 12 months for business reasons, 54% rented a car during the past 12 months for personal reasons, and 30% rented a car during the past 12 months for both business and personal reasons.
• What is the probability that a subscriber rented a car during the past 12 months for business or personal reasons?
• What is the probability that a subscriber did not rent a car during the past 12 months for either business or personal reasons?