Bus. 190 Ch.2

Events A and B are mutually exclusive. Which of the following statements is also true? a. A and B are also independent b. P(A U B) = P(A)P(B) c. P(A U B) = P(A) + P(B) d. P(A ∩ B) = P(A) + P(B)

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If 50 of 250 people contacted make a donation to the city symphony, then the relative frequency method assigns a probability of .2 to the outcome of making a donation. a. True b. False

a

If A and B are independent events, then P(A^B) = P(A)P(B). a. True b. False

a

If A and B are mutually exclusive events, then P(A | B) = 0. a. True b. False

a

A graphical device used for enumerating sample points in a multiple-step experiment is a Venn diagram. a. True b. False

b

A joint probability can have a value greater than 1. a. True b. False

b

An automobile dealership is waiting to take delivery of nine new cars. Today, anywhere from zero to all nine cars might be delivered. It is appropriate to use the classical method to assign a probability of 1/10 to each of the possible numbers that could be delivered. a. True b. False

b

If A and B are independent events with P(A) = 0.1 and P(B) = 0.5, then P(A B) = .6. a. True b. False

b

P(A ^ B) ≥ P(A) [^is the intersection] a. True b. False

b

P(A|B) + P(A|Bc) = 1 for all events A and B. Bc= complement a. True b. False

b

P(A|B) = 1 − P(B|A) for all events A and B. a. True b. False

b