Chapter 4 quizes probability and Statistics

Question 1 If P(A) = .50, P(B) = .60, and P(A ∩ B) = .30, then events A and B are _____. Selected b. Answer: mutually exclusive events Answers: a. Not enough information is given to answer this question. b. mutually exclusive events c. not independent events 0 out of 4 points d. independent events Question 2 4 out of 4 points A couple has three children. Assuming each child has an equal chance of being a boy or a girl, what is the probability that they have at least one girl? Selected d. Answer: .875 Answers: a. .5 b. 1 c. .125 d. .875 Question3 One of the basic requirements of probability is _____. Selected c. Answer: both P(A) = P(Ac) − 1 and if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1 Answers: a. P(A) = P(Ac) – 1 b. for each experimental outcome Ei, we must have P(Ei) ≥ 1 c. both P(A) = P(Ac) − 1 and if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1 d. if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1 0