Ch. 4 Quiz and Study Guide

Question 1

A _________ is a measure of the chance that an uncertain event will occur.
a. random experiment
b. sample space
c. probability
d. complement

Answer 1

c. probability

Question 2

The ________ of two events X and Y is another event that consists of the sample space outcomes
belonging to either event X or event Y or both events X and Y.
a. complement
b. union
c. intersection
d. conditional probability

Answer 2

b. union

Question 3

P(A∪B) = P(A) + P(B) - P(A⋂B) represents the formula for the:
a. conditional probability
b. addition rule
c. addition rule for two mutually exclusive events
d. multiplication rule

Answer 3

b. addition rule

Question 4

A process of observation that has an uncertain outcome is referred to as a(n) ________.
a. probability
b. frequency
c. conditional probability
d. experiment

Answer 4

d. experiment

Question 5

A probability may be interpreted as a long-run ________ frequency.
a. observational
b. relative
c. experimental
d. conditional

Answer 5

b. relative

Question 6

A(n) ________ probability is a probability assessment that is based on experience, intuitive judgment, or expertise.
a. experimental
b. relative frequency
c. objective
d. subjective

Answer 6

d. subjective

Question 7

Probabilities must be assigned to sample space outcomes so that the probability assigned to each
sample space outcome must be between ________, inclusive.
a. 0 and 100
b. −100 and 100
c. 0 and 1
d. −1 and 1

Answer 7

c. 0 and 1

Question 8

What is the probability of rolling a seven with a pair of fair dice?
a.) 6/36
b.) 3/36
c.) 1/36
d.) 8/36
e.) 7/36

Answer 8

a.) 6/36

Question 9

What is the probability that an even number appears on the toss of a die?
a.) 0.5
b.) 0.33
c.) 0.25
d.) 0.67
e.) 1.00

Answer 9

a.) 0.5

Question 10

The ________ of event X consists of all sample space outcomes that do not correspond to the occurrence of event X.
a.) independence
b.) complement
c.) conditional probability
d.) dependence

Answer 10

b.) complement

Question 11

Four people will enter an automobile showroom, and each will either purchase a car (P) or not
purchase a car (N).

How many sample space of all possible decisions that could be potentially made by the people?
a.) 4
b.) 64
c.) 32
d.) 16

Answer 11

d.) 16

(4^2 = 16, or can draw a tree diagram to solve)