eco 45 3

The collection of all possible sample points in an experiment is a. the sample space b. a sample point c. an experiment d. the population

a. the sample space

If P(A) = 0.4, P(B | A) = 0.35, P(A B) = 0.69, then P(B) = a. 0.14 b. 0.43 c. 0.75 d. 0.59

b. 0.43

If A and B are independent events with P(A) = 0.4 and P(B) = 0.25, then P(A B) = a. 0.65 b. 0.55 c. 0.10 d. 0.75

b. 0.55

Which of the following statements is always true? a. -1 P(Ei) 1 b. P(A) = 1 - P(Ac) c. P(A) + P(B) = 1 d. P 1

b. P(A) = 1 - P(Ac)

Two events are mutually exclusive a. if their intersection is 1 b. if they have no sample points in common c. if their intersection is 0.5 d. None of these alternatives is correct.

b. if they have no sample points in common

From a group of six people, two individuals are to be selected at random. How many possible selections are possible? a. 12 b. 36 c. 15 d. 8

c. 15

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 n B) = P(A) + P(B)

c. P(A U B) = P(A) + P(B)

Events A and B are mutually exclusive if their joint probability is a. larger than 1 b. less than zero c. zero d. infinity

c. zero

If P(A) = 0.62, P(B) = 0.47, and P(A B) = 0.88, then P(A B) = a. 0.2914 b. 1.9700 c. 0.6700 d. 0.2100

d. 0.2100

Each customer entering a department store will either buy or not buy some merchandise. An experiment consists of following 3 customers and determining whether or not they purchase any merchandise. The number of sample points in this experiment is a. 2 b. 4 c. 6 d. 8

d. 8

When the assumption of equally likely outcomes is used to assign probability values, the method used to assign probabilities is referred to as the a. relative frequency method b. subjective method c. probability method d. classical method

d. classical method

Initial estimates of the probabilities of events are known as a. sets b. posterior probabilities c. conditional probabilities d. prior probabilities

d. prior probabilities