Question 1

Which of these statements is a property of the probability distribution for a discrete random variable x ?

Accepted Answer

A)   The probabilities must be nonnegative.
B)   The probabilities must sum to 1.
C)   The random variable must take on positive values between 0 and 1.
D)   Both (a)  and (b)  are true.

Question 2

Probability is the tool that allows the statistician to use sample information to make inferences about or describe the population from which the sample was drawn.

Accepted Answer

A) True 
 B)False

Question 3

The complement of an event A, denoted by  , consists of all the simple events in the sample space S that are not in A.

Accepted Answer

A) True 
 B)False

Question 4

Suppose you are told that an experiment consists of three stages and that there are three ways to accomplish the first stage, four ways to accomplish the second stage, and five to accomplish the third stage. What would be the number of ways to accomplish the experiment?

Accepted Answer

A)   12
B)   15
C)   20
D)   60

Question 5

The graph of a discrete random variable looks like a histogram in which the probability of each possible outcome is represented by a bar.

Accepted Answer

A) True 
 B)False

Question 6

What is the set of all simple events of an experiment called?

Accepted Answer

A)   a compound event
B)   a sample space
C)   a population
D)   a random sample

Question 7

If P(A)  = 0.42 and P(B)  = 0.38, then what is P(A  B) ?

Accepted Answer

A)   0.80
B)   0.58
C)   0.04
D)   cannot be determined from the information given

Exam 4: A: probability and Probability Distributions

If P(A) = 0.42 and P(B) = 0.38, then what is P(A B) ?

Correct Answer
verified

The graph of a discrete random variable looks like a histogram in which the probability of each possible outcome is represented by a bar.

Correct Answer
verified

Which of these statements is a property of the probability distribution for a discrete random variable x ?

Correct Answer
verified

What is the set of all simple events of an experiment called?

Correct Answer
verified

The complement of an event A, denoted by , consists of all the simple events in the sample space S that are not in A.

Correct Answer
verified

Probability is the tool that allows the statistician to use sample information to make inferences about or describe the population from which the sample was drawn.

Correct Answer
verified

Suppose you are told that an experiment consists of three stages and that there are three ways to accomplish the first stage, four ways to accomplish the second stage, and five to accomplish the third stage. What would be the number of ways to accomplish the experiment?

Correct Answer
verified

Exam 4: A: probability and Probability Distributions

If P(A) = 0.42 and P(B) = 0.38, then what is P(A B) ?

Correct AnswerverifiedShow Answer

The graph of a discrete random variable looks like a histogram in which the probability of each possible outcome is represented by a bar.

Correct AnswerverifiedShow Answer

Which of these statements is a property of the probability distribution for a discrete random variable x ?

Correct AnswerverifiedShow Answer

What is the set of all simple events of an experiment called?

Correct AnswerverifiedShow Answer

The complement of an event A, denoted by , consists of all the simple events in the sample space S that are not in A.

Correct AnswerverifiedShow Answer

Probability is the tool that allows the statistician to use sample information to make inferences about or describe the population from which the sample was drawn.

Correct AnswerverifiedShow Answer

Suppose you are told that an experiment consists of three stages and that there are three ways to accomplish the first stage, four ways to accomplish the second stage, and five to accomplish the third stage. What would be the number of ways to accomplish the experiment?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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