Statistics Quiz

55. If A and B are independent events with P(A) = 0.2 and P(B) = 0.6, then P(A or B) = a. 0.62 b. 0.12 c. 0.60 d. 0.68

d. 0.68

5. Any process that generates well-defined outcomes is a. an event b. an experiment c. a sample point d. a sample space

b. an experiment

22. Two events with nonzero probabilities a. can be both mutually exclusive and independent b. can not be both mutually exclusive and independent c. are always mutually exclusive d. are always independent

b. can not be both mutually exclusive and independent

43. On a December day, the probability of snow is .30. The probability of a "cold" day is .50. The probability of snow and "cold" weather is .15. Are snow and "cold" weather independent events? a. only if given that it snowed b. no c. yes d. only when they are also mutually exclusive

c. yes

58. If A and B are mutually exclusive events with P(A) = 0.3 and P(B) = 0.5, then P(A or B) = a. 0.00 b. 0.15 c. 0.8 d. 0.2

c. 0.8

56. If A and B are independent events with P(A) = 0.05 and P(B) = 0.65, then P(A given B) = a. 0.05 b. 0.0325 c. 0.65 d. 0.8

a. 0.05

2. 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

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

b. 0.43

78. If P(A) = 0.50, P(B) = 0.40, then, and P(A B) = 0.88, then P(B A) = a. 0.02 b. 0.03 c. 0.04 d. 0.05

c. 0.04

31. If A and B are independent events with P(A) = 0.65 and P(A and B) = 0.26, then, P(B) = a. 0.400 b. 0.169 c. 0.390 d. 0.650

a. 0.400

19. 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)

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

57. If A and B are mutually exclusive events with P(A) = 0.3 and P(B) = 0.5, then P(A and B) = a. 0.30 b. 0.15 c. 0.00 d. 0.20

c. 0.00

34. Given that event E has a probability of 0.31, the probability of the complement of event E a. cannot be determined with the above information b. can have any value between zero and one c. 0.69 d. is 0.31

c. 0.69

30. If a six sided die is tossed two times and "3" shows up both times, the probability of "3" on the third trial is a. much larger than any other outcome b. much smaller than any other outcome c. 1/6 d. 1/216

c. 1/6

63. 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 or B) = P(A)P(B) c. P(A or B) = P(A) + P(B) d. P(A or B) = P(A) + P(B)

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