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Question ID# 444 - Statistics - Probability

Added on 07/19/2010.

Teacher Information
Shawn Cheng (answered 20 questions)BA, UC Berkeley, anticipated 2014.

Probability Questions

1- When two events A and B are independent the intersection of the events can be found by multiplying the probabilities of the individual events.

True False

2- The empirical view of probability is based on relative frequencies of experimental outcomes.

True False

3- The expected value of a discrete random variable E(X), is the sum of all X values weighted by their respective probabilities.

True False

4- A probability distribution

A) is a listing of all possible values of a random variable.

B) is a listing of all possible values of a random variable, along with their probabilities.

C) can assume values between -1 and +1.

D) has none of the above properties.

5- Which one is a discrete random variable?

A) The number of births in a hospital on a given day.

B) The number of fives obtained in four rolls of a die.

C) The amount of water released from the Folsom Dam.

D) The number of applicants applying for a civil service job in the post office.

E) A, B, and D

6- Which is a not a discrete random variable?

A) The number of births in a hospital on a given day.

B) The number of fives obtained in four rolls of a die.

C) The amount of water released from the Folsom Dam.

D) The number of applicants applying for a civil service job in the post office.

Use the following to answer 7 - 9

This table shows a cross-tabulation of employee age versus absenteeism during January at the Zarthan Company.

7- What is P(B)?

8- What is P(A U B)?

9- What is P(B | A)?

10- Consider the following probability distribution of the variable X:

What is the expected value of this variable?

Solution:

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