Question 1

The speed at which a jet plane can fly is an example of _________.

Accepted Answer

A)  neither discrete nor continuous random variable 
B)  both discrete and continuous random variable 
C)  a continuous random variable 
D)  a discrete random variable 
E)  a constant 
A)  neither discrete nor continuous random variable 
B)  both discrete and continuous random variable 
C)  a continuous random variable 
D)  a discrete random variable 
E)  a constant

Question 2

Suppose that during a given week,20 new customers have signed up for a specialized service your company provides.Eight of these new customers are automotive companies,and the remaining twelve are financial services firms.If a random sample of 5 of these new customers will be selected for a study of customer satisfaction in one month,what is the probability that 2 of the selected customers are financial services firms?

Accepted Answer

A)  0.232 
B)  0.234 
C)  0.236 
D)  0.238 
E)  0.240 
A)  0.232 
B)  0.234 
C)  0.236 
D)  0.238 
E)  0.240

Question 3

A market research team compiled the following discrete probability distribution for families residing in Randolph County. In this distribution,x represents the number of evenings the family dines outside their home during a week.   The mean (average)value of x is _______________.

Accepted Answer

A)  1.0 
B)  1.5 
C)  2.0 
D)  2.5 
E)  3.0 
A)  1.0 
B)  1.5 
C)  2.0 
D)  2.5 
E)  3.0

Question 4

From recent polls about customer satisfaction,you know that 85% of the clients of your company are highly satisfied and want to renew their contracts.If you select a random sample of 30 clients,what is the probability that exactly 25 are highly satisfied?

Accepted Answer

A)  .184 
B)  .186 
C)  .188 
D)  .190 
E)  .192 
A)  .184 
B)  .186 
C)  .188 
D)  .190 
E)  .192

Question 5

If sampling is performed without replacement,the hypergeometric distribution should be used. However,the binomial may be used to approximate this if _______.

Accepted Answer

A) n > 5%N B) n < 5%N C) the population size is very small D) there are more than two possible outcomes of each trial E) the outcomes are continuous A) n > 5%N B) n < 5%N C) the population size is very small D) there are more than two possible outcomes of each trial E) the outcomes are continuous

Question 6

The following graph is a binomial distribution with n = 6.   This graph reveals that ____________.

Accepted Answer

A)  p = 0.5 
B)  p = 1.0 
C)  p = 0 
D)  p < 0.5 
E)  p = 1.5 
A)  p = 0.5 
B)  p = 1.0 
C)  p = 0 
D)  p < 0.5 
E)  p = 1.5

Question 7

As in a binomial distribution,each trial of a hypergeometric distribution results in one of two mutually exclusive outcomes,i.e.,either a success or a failure.

Accepted Answer

A) True 
 B)False

Question 8

It is known that screws produced by a certain company will be defective with probability .01 independently of each other.The company sells the screws in packages of 25 and offers a money-back guarantee that at most 1 of the 25 screws is defective.Using Poisson approximation for binomial distribution,the probability that the company must replace a package is approximately _________

Accepted Answer

A)  0.01 
B)  0.1947 
C)  0.7788 
D)  0.0264 
E)  0.2211 
A)  0.01 
B)  0.1947 
C)  0.7788 
D)  0.0264 
E)  0.2211

Question 9

The hypergeometric distribution must be used instead of the binomial distribution when ______

Accepted Answer

A)  sampling is done with replacement 
B)  sampling is done without replacement 
C)  n≥5% N 
D)  both b and c 
E)  there are more than two possible outcomes 
A)  sampling is done with replacement 
B)  sampling is done without replacement 
C)  n≥5% N 
D)  both b and c 
E)  there are more than two possible outcomes

Question 10

A binomial distribution is better than a Poisson distribution to describe the occurrence of major oil spills in the Gulf of Mexico.

Accepted Answer

A) True 
 B)False

Question 11

The assumption of independent trials in a binomial distribution is not a great concern if the sample size is smaller than 1/20th of the population size.

Accepted Answer

A) True 
 B)False

Question 12

Circuit boards for wireless telephones are etched,in an acid bath,in batches of 100 boards. A sample of seven boards is randomly selected from each lot for inspection. A particular batch contains two defective boards; and x is the number of defective boards in the sample. P(x=0)is _______.

Accepted Answer

A)  0.1315 
B)  0.8642 
C)  0.0042 
D)  0.6134 
E)  0.8134 
A)  0.1315 
B)  0.8642 
C)  0.0042 
D)  0.6134 
E)  0.8134

Question 13

You are offered an investment opportunity. Its outcomes and probabilities are presented in the following table.   Which of the following statements is true?

Accepted Answer

A)  This distribution is skewed to the right. 
B)  This is a binomial distribution. 
C)  This distribution is symmetric. 
D)  This distribution is skewed to the left. 
E)  This is a Poisson distribution 
A)  This distribution is skewed to the right. 
B)  This is a binomial distribution. 
C)  This distribution is symmetric. 
D)  This distribution is skewed to the left. 
E)  This is a Poisson distribution

Question 14

The following graph is a binomial distribution with n = 6.   This graph reveals that ____________.

Accepted Answer

A) p > 0.5 B) p = 1.0 C) p = 0 D) p < 0.5 E) p = 1.5 A) p > 0.5 B) p = 1.0 C) p = 0 D) p < 0.5 E) p = 1.5

Question 15

In American Roulette,there are two zeroes and 36 non-zero numbers (18 red and 18 black).If a player bets 1 unit on red,his chance of winning 1 unit is therefore 18/38 and his chance of losing 1 unit (or winning -1)is 20/38.Let x be the player profit per game.The mean (average)value of x is approximately_______________.

Accepted Answer

A)  0.0526 
B)  -0.0526 
C)  1 
D)  -1 
E)  0 
A)  0.0526 
B)  -0.0526 
C)  1 
D)  -1 
E)  0

Question 16

Pinky Bauer,Chief Financial Officer of Harrison Haulers,Inc.,suspects irregularities in the payroll system,and orders an inspection of a random sample of vouchers issued since January 1,2006. A sample of ten vouchers is randomly selected,without replacement,from the population of 2,000 vouchers.Each voucher in the sample is examined for errors and the number of vouchers in the sample with errors is denoted by x.If 20% of the population of vouchers contain errors,P(x>0)is _______________.

Accepted Answer

A)  0.8171 
B)  0.1074 
C)  0.8926 
D)  0.3020 
E)  1.0000 
A)  0.8171 
B)  0.1074 
C)  0.8926 
D)  0.3020 
E)  1.0000

Question 17

Which of the following conditions is not a condition for the hypergeometric distribution?

Accepted Answer

A)  the probability of success is the same on each trial 
B)  sampling is done without replacement 
C)  there are only two possible outcomes 
D)  trials are dependent 
E)  n < 5%N 
A)  the probability of success is the same on each trial 
B)  sampling is done without replacement 
C)  there are only two possible outcomes 
D)  trials are dependent 
E)  n < 5%N

Question 18

For the Poisson distribution the mean represents twice the value of the standard deviation..

Accepted Answer

A) True 
 B)False

Question 19

From recent polls about customer satisfaction,you know that 85% of the clients of your company are highly satisfied and want to renew their contracts.If you select a random sample of 30 clients,what is the probability that at least one client is dissatisfied?

Accepted Answer

A)  .984 
B)  .986 
C)  .988 
D)  .990 
E) .992 
A)  .984 
B)  .986 
C)  .988 
D)  .990 
E) .992

Question 20

The number of visitors to a website each day is an example of a discrete random variable

Accepted Answer

A) True 
 B)False

The speed at which a jet plane can fly is an example of _________.

A market research team compiled the following discrete probability distribution for families residing in Randolph County. In this distribution,x represents the number of evenings the family dines outside their home during a week. The mean (average)value of x is _______________.

From recent polls about customer satisfaction,you know that 85% of the clients of your company are highly satisfied and want to renew their contracts.If you select a random sample of 30 clients,what is the probability that exactly 25 are highly satisfied?

If sampling is performed without replacement,the hypergeometric distribution should be used. However,the binomial may be used to approximate this if _______.

The following graph is a binomial distribution with n = 6. This graph reveals that ____________.

As in a binomial distribution,each trial of a hypergeometric distribution results in one of two mutually exclusive outcomes,i.e.,either a success or a failure.

The hypergeometric distribution must be used instead of the binomial distribution when ______

A binomial distribution is better than a Poisson distribution to describe the occurrence of major oil spills in the Gulf of Mexico.

The assumption of independent trials in a binomial distribution is not a great concern if the sample size is smaller than 1/20^th of the population size.

Circuit boards for wireless telephones are etched,in an acid bath,in batches of 100 boards. A sample of seven boards is randomly selected from each lot for inspection. A particular batch contains two defective boards; and x is the number of defective boards in the sample. P(x=0)is _______.

You are offered an investment opportunity. Its outcomes and probabilities are presented in the following table. Which of the following statements is true?

The following graph is a binomial distribution with n = 6. This graph reveals that ____________.

Which of the following conditions is not a condition for the hypergeometric distribution?

For the Poisson distribution the mean represents twice the value of the standard deviation..

From recent polls about customer satisfaction,you know that 85% of the clients of your company are highly satisfied and want to renew their contracts.If you select a random sample of 30 clients,what is the probability that at least one client is dissatisfied?

The number of visitors to a website each day is an example of a discrete random variable

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

A Nalysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

Exam 5: Discrete Distributions

The speed at which a jet plane can fly is an example of _________.

A market research team compiled the following discrete probability distribution for families residing in Randolph County. In this distribution,x represents the number of evenings the family dines outside their home during a week. The mean (average)value of x is _______________.

From recent polls about customer satisfaction,you know that 85% of the clients of your company are highly satisfied and want to renew their contracts.If you select a random sample of 30 clients,what is the probability that exactly 25 are highly satisfied?

If sampling is performed without replacement,the hypergeometric distribution should be used. However,the binomial may be used to approximate this if _______.

The following graph is a binomial distribution with n = 6. This graph reveals that ____________.

As in a binomial distribution,each trial of a hypergeometric distribution results in one of two mutually exclusive outcomes,i.e.,either a success or a failure.

The hypergeometric distribution must be used instead of the binomial distribution when ______

A binomial distribution is better than a Poisson distribution to describe the occurrence of major oil spills in the Gulf of Mexico.

The assumption of independent trials in a binomial distribution is not a great concern if the sample size is smaller than 1/20th of the population size.

Circuit boards for wireless telephones are etched,in an acid bath,in batches of 100 boards. A sample of seven boards is randomly selected from each lot for inspection. A particular batch contains two defective boards; and x is the number of defective boards in the sample. P(x=0)is _______.

You are offered an investment opportunity. Its outcomes and probabilities are presented in the following table. Which of the following statements is true?

The following graph is a binomial distribution with n = 6. This graph reveals that ____________.

Which of the following conditions is not a condition for the hypergeometric distribution?

For the Poisson distribution the mean represents twice the value of the standard deviation..

From recent polls about customer satisfaction,you know that 85% of the clients of your company are highly satisfied and want to renew their contracts.If you select a random sample of 30 clients,what is the probability that at least one client is dissatisfied?

The number of visitors to a website each day is an example of a discrete random variable

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

A Nalysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

The assumption of independent trials in a binomial distribution is not a great concern if the sample size is smaller than 1/20^th of the population size.