Question 1

For a random variable X,the mean value of the squared deviations of its values from their expected value is called its

Accepted Answer

A) Standard Deviation 
B) Mean 
C) Probability 
D) Variance 
A) Standard Deviation 
B) Mean 
C) Probability 
D) Variance D

Question 2

The variable "home ownership" can take on one of two values,1 if the person living in a home owns the home and zero if the person living in a home does not own the home is an example of a discrete random variable.

Accepted Answer

A) True 
 B)False  True

Question 3

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store: Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute,find the standard deviation of X.

Accepted Answer

A) 3 
B) 9 
C) 1.5 
D) 1.7 
A) 3 
B) 9 
C) 1.5 
D) 1.7 D

Question 4

If in a hypergeometric distribution r is 300,N = 600 and n = 150,estimate the binomial probability of success.

Accepted Answer

A) 0.500 
B) 0.333 
C) 0.083 
D) 0.250 
A) 0.500 
B) 0.333 
C) 0.083 
D) 0.250

Question 5

The manager of the local grocery store has determined that,on the average,4 customers use the service desk every half-hour.Assume that the number of customers using the service desk has a Poisson distribution. What is the probability that during a randomly selected half-hour period exactly 2 customers use the service desk?

Accepted Answer

A) .0183 
B) .0733 
C) .1465 
D) .9084 
E) .7619 
A) .0183 
B) .0733 
C) .1465 
D) .9084 
E) .7619

Question 6

A fair die is rolled 10 times.What is the probability that an odd number (1,3,or 5)will occur less than 3 times?

Accepted Answer

A) .0547 
B) .1172 
C) .1550 
D) .7752 
E) .8450 
A) .0547 
B) .1172 
C) .1550 
D) .7752 
E) .8450

Question 7

The variable "employment status" which can take on one of two values: 1 for "employed" and 0 for "unemployed" is an example of a _____________ random variable.

Accepted Answer

A) Poisson 
B) Discrete 
C) Hypergeometric 
D) Continuous 
A) Poisson 
B) Discrete 
C) Hypergeometric 
D) Continuous

Question 8

A random variable that is defined to be the total number of successes in n trials is a _____ random variable.

Accepted Answer

A) Binomial 
B) Poisson 
C) Hypergeometric 
D) Continuous 
A) Binomial 
B) Poisson 
C) Hypergeometric 
D) Continuous

Question 9

If x is a Poisson random variable with a mean of 10,what is the probability that x is equal to 8?

Accepted Answer

A) .1126 
B) .1251 
C) .2677 
D) .0993 
A) .1126 
B) .1251 
C) .2677 
D) .0993

Question 10

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the probability of 3 customers arriving within a minute.

Accepted Answer

A) 1.00 
B) .1494 
C) .224 
D) .3734 
A) 1.00 
B) .1494 
C) .224 
D) .3734

Question 11

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the expected value of X.

Accepted Answer

A) 3 
B) 9 
C) 1.5 
D) 1.7 
A) 3 
B) 9 
C) 1.5 
D) 1.7

Question 12

For a binomial process,the probability of success is 40% and the number of trials is 5. Find the standard deviation.

Accepted Answer

A) 5.0 
B) 1.2 
C) 2.0 
D) 1.1 
A) 5.0 
B) 1.2 
C) 2.0 
D) 1.1

Question 13

The J.O.Supplies Company buys calculators from a Korean supplier.The probability of a defective calculator is 10%. If 3 calculators are selected at random,what is the probability that one of the calculators will be defective?

Accepted Answer

A) .0702 
B) .0010 
C) .2430 
D) .7290 
A) .0702 
B) .0010 
C) .2430 
D) .7290

Question 14

If p = .1 and n = 5,then the corresponding binomial distribution is

Accepted Answer

A) Right skewed 
B) Left skewed 
C) Symmetric 
D) Bimodal 
A) Right skewed 
B) Left skewed 
C) Symmetric 
D) Bimodal

Question 15

The binomial distribution is characterized by situations that are analogous to

Accepted Answer

A) Drawing balls from and urn. 
B) Coin tossing. 
C) Counting defects on an item. 
D) Measuring the length of an item. 
A) Drawing balls from and urn. 
B) Coin tossing. 
C) Counting defects on an item. 
D) Measuring the length of an item.

Question 16

For a binomial process,the probability of success is 40% and the number of trials is 5. Find P(X > 4).

Accepted Answer

A) .0102 
B) .0778 
C) .0870 
D) .3370 
A) .0102 
B) .0778 
C) .0870 
D) .3370

Question 17

In a binomial experiment,the results of one trial are dependent on the results of other trials.

Accepted Answer

A) True 
 B)False

Question 18

If the number of surface nonconformities on a specific size of metal piece is the discrete random variable in question,then the appropriate probability distribution that can describe the probability of a specific size metal sheet containing 3 defectives is given most likely by ___________________ distribution.

Accepted Answer

A) Binomial 
B) Poisson 
C) Hypergeometric 
D) Both A and B 
A) Binomial 
B) Poisson 
C) Hypergeometric 
D) Both A and B

Question 19

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the probability of more than 7 customers arriving within a minute.

Accepted Answer

A) .0216 
B) .0081 
C) .0108 
D) .0118 
A) .0216 
B) .0081 
C) .0108 
D) .0118

Question 20

Suppose that x has a hypergeometric distribution with N = 10,r = 5 and n = 3.Calculate the mean of the distribution.

Accepted Answer

A) 0.500 
B) 0.333 
C) 1.500 
D) 3.000 
A) 0.500 
B) 0.333 
C) 1.500 
D) 3.000

For a random variable X,the mean value of the squared deviations of its values from their expected value is called its

The variable "home ownership" can take on one of two values,1 if the person living in a home owns the home and zero if the person living in a home does not own the home is an example of a discrete random variable.

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store: Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute,find the standard deviation of X.

If in a hypergeometric distribution r is 300,N = 600 and n = 150,estimate the binomial probability of success.

A fair die is rolled 10 times.What is the probability that an odd number (1,3,or 5)will occur less than 3 times?

The variable "employment status" which can take on one of two values: 1 for "employed" and 0 for "unemployed" is an example of a _____________ random variable.

A random variable that is defined to be the total number of successes in n trials is a _____ random variable.

If x is a Poisson random variable with a mean of 10,what is the probability that x is equal to 8?

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the probability of 3 customers arriving within a minute.

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the expected value of X.

For a binomial process,the probability of success is 40% and the number of trials is 5. Find the standard deviation.

The J.O.Supplies Company buys calculators from a Korean supplier.The probability of a defective calculator is 10%. If 3 calculators are selected at random,what is the probability that one of the calculators will be defective?

If p = .1 and n = 5,then the corresponding binomial distribution is

The binomial distribution is characterized by situations that are analogous to

For a binomial process,the probability of success is 40% and the number of trials is 5. Find P(X > 4).

In a binomial experiment,the results of one trial are dependent on the results of other trials.

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the probability of more than 7 customers arriving within a minute.

Suppose that x has a hypergeometric distribution with N = 10,r = 5 and n = 3.Calculate the mean of the distribution.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Process Improvement Using Control Charts

Nonparametric Methods

Decision Theory

Filters

Exam 5: Discrete Random Variables

For a random variable X,the mean value of the squared deviations of its values from their expected value is called its

The variable "home ownership" can take on one of two values,1 if the person living in a home owns the home and zero if the person living in a home does not own the home is an example of a discrete random variable.

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store: Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute,find the standard deviation of X.

If in a hypergeometric distribution r is 300,N = 600 and n = 150,estimate the binomial probability of success.

A fair die is rolled 10 times.What is the probability that an odd number (1,3,or 5)will occur less than 3 times?

The variable "employment status" which can take on one of two values: 1 for "employed" and 0 for "unemployed" is an example of a _____________ random variable.

A random variable that is defined to be the total number of successes in n trials is a _____ random variable.

If x is a Poisson random variable with a mean of 10,what is the probability that x is equal to 8?

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the probability of 3 customers arriving within a minute.

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the expected value of X.

For a binomial process,the probability of success is 40% and the number of trials is 5. Find the standard deviation.

The J.O.Supplies Company buys calculators from a Korean supplier.The probability of a defective calculator is 10%. If 3 calculators are selected at random,what is the probability that one of the calculators will be defective?

If p = .1 and n = 5,then the corresponding binomial distribution is

The binomial distribution is characterized by situations that are analogous to

For a binomial process,the probability of success is 40% and the number of trials is 5. Find P(X > 4).

In a binomial experiment,the results of one trial are dependent on the results of other trials.

Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store.If X = the number of arrivals per minute: Find the probability of more than 7 customers arriving within a minute.

Suppose that x has a hypergeometric distribution with N = 10,r = 5 and n = 3.Calculate the mean of the distribution.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Process Improvement Using Control Charts

Nonparametric Methods

Decision Theory

Filters