Question 1

A random variable

Accepted Answer

A)  is the result of a measurement. 
B)  can only be discrete. 
C)  assigns one and only one numeric value to each experimental outcome. 
D)  is a binomial,Poisson,or hypergeometric variable. 
A)  is the result of a measurement. 
B)  can only be discrete. 
C)  assigns one and only one numeric value to each experimental outcome. 
D)  is a binomial,Poisson,or hypergeometric variable. C

Question 2

According to a survey of adults,64 percent have money in a bank savings account.If we were to survey 50 randomly selected adults,find the mean number of adults who would have bank savings accounts.

Accepted Answer

A)  12 
B)  22 
C)  32 
D)  42 
A)  12 
B)  22 
C)  32 
D)  42 C

Question 3

An appliance manufacturer gives a warranty,and 95 percent of its appliances do not require repair before the warranty expires.An organization buys 10 of these appliances.Calculate an interval that contains 95.44 percent of all the appliances that will not require repair.

Accepted Answer

A)  [8.12,10.88] 
B)  [7.43,11.57] 
C)  [8.81,10.19] 
D)  [8.55,10.45] 
A)  [8.12,10.88] 
B)  [7.43,11.57] 
C)  [8.81,10.19] 
D)  [8.55,10.45] A

Question 4

Using the following probability distribution table of the random variable x,what is the probability of x = 3?

Accepted Answer

A)  3/15 
B)  5/15 
C)  1/15 
D)  2/15 
A)  3/15 
B)  5/15 
C)  1/15 
D)  2/15

Question 5

The Securities and Exchange Commission has determined that the number of companies listed on the NYSE declaring bankruptcy is approximately a Poisson distribution with a mean of 2.6 per month.Find the probability that more than 1 bankruptcy occurs next month.

Accepted Answer

A)  .1931 
B)  .9257 
C)  .7326 
D)  .4816 
E)  .2674 
A)  .1931 
B)  .9257 
C)  .7326 
D)  .4816 
E)  .2674

Question 6

A correlation coefficient is a unitless measure of the linear relationship between two random variables.

Accepted Answer

A) True 
 B)False

Question 7

The Securities and Exchange Commission has determined that the number of companies listed on the NYSE declaring bankruptcy is approximately a Poisson distribution with a mean of 2.6 per month.Find the probability that no more than one bankruptcy occurs next month.

Accepted Answer

A)  .1931 
B)  .9257 
C)  .7326 
D)  .4816 
E)  .2674 
A)  .1931 
B)  .9257 
C)  .7326 
D)  .4816 
E)  .2674

Question 8

The J.O.Supplies Company buys calculators from a non-US supplier.The probability of a defective calculator is 10 percent.If 10 calculators are selected at random,what is the probability that 3 or more of the calculators will be defective?

Accepted Answer

A)  .0702 
B)  .2639 
C)  .0016 
D)  0 
A)  .0702 
B)  .2639 
C)  .0016 
D)  0

Question 9

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 10

A hypergeometric random variable x has a distribution that is approximated by a binomial distribution when

Accepted Answer

A)  the number of successes is larger than the number of failures in the population. 
B)  a sample is selected from the population without replacement. 
C)  the population is much larger than the sample size. 
D)  the sample size is half the size of the original population. 
A)  the number of successes is larger than the number of failures in the population. 
B)  a sample is selected from the population without replacement. 
C)  the population is much larger than the sample size. 
D)  the sample size is half the size of the original population.

Question 11

A discrete probability distribution is expressed as a table,graph,or ___________ that gives the probability associated with each possible value that the random variable can assume.

Accepted Answer

A)  binomial 
B)  formula 
C)  Poisson 
D)  hypergeometric 
A)  binomial 
B)  formula 
C)  Poisson 
D)  hypergeometric

Question 12

The time (in seconds)it takes for an athlete to run 50 meters is an example of a continuous random variable.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following is not a discrete random variable?

Accepted Answer

A)  the number of times a light changes red in a 10-minute cycle 
B)  the number of minutes required to run 1 mile 
C)  the number of defects in a sample selected from a population of 100 products 
D)  the number of criminals found in a five-mile radius of a neighborhood 
A)  the number of times a light changes red in a 10-minute cycle 
B)  the number of minutes required to run 1 mile 
C)  the number of defects in a sample selected from a population of 100 products 
D)  the number of criminals found in a five-mile radius of a neighborhood

Question 14

The requirement that the probability of success remains constant from trial to trial is a property of the _________________ distribution.

Accepted Answer

A)  binomial 
B)  uniform 
C)  normal 
D)  Poisson 
A)  binomial 
B)  uniform 
C)  normal 
D)  Poisson

Question 15

If the population size is at least 20 times larger than the sample size,a hypergeometric distribution can be approximated by the binomial distribution.

Accepted Answer

A) True 
 B)False

Question 16

A study conducted by a local university found that 25 percent of college freshmen support increased spending on environmental issues.If 6 college freshmen are randomly selected,find the probability that exactly 3 support increased spending on environmental issues.

Accepted Answer

A)  .0330 
B)  .1318 
C)  .7844 
D)  .9624 
A)  .0330 
B)  .1318 
C)  .7844 
D)  .9624

Question 17

The probability distribution of a random variable that is defined to be the number of successes obtained in a random sample selected without replacement from a finite population of N elements that contains r successes and N − r failures is

Accepted Answer

A)  Poisson. 
B)  binomial. 
C)  hypergeometric. 
D)  discrete. 
A)  Poisson. 
B)  binomial. 
C)  hypergeometric. 
D)  discrete.

Question 18

In a binomial distribution,the random variable X is continuous.

Accepted Answer

A) True 
 B)False

Question 19

Of all individual tax returns,37 percent include errors made by the taxpayer.If IRS examiners are assigned randomly selected returns in batches of 12,find the mean and standard deviation for the number of erroneous returns per batch.

Accepted Answer

A)  μ = 2.80,σ = 1.67 
B)  μ = 4.44,σ = 1.67 
C)  μ = 4.44,σ = 2.80 
D)  μ = 7.56,σ = 2.80 
A)  μ = 2.80,σ = 1.67 
B)  μ = 4.44,σ = 1.67 
C)  μ = 4.44,σ = 2.80 
D)  μ = 7.56,σ = 2.80

Question 20

The number of ways to arrange x successes among n trials is equal to

Accepted Answer

A)   
B) 
  
C) 
  
D)   
A)   
B) 
  
C) 
  
D)

A random variable

According to a survey of adults,64 percent have money in a bank savings account.If we were to survey 50 randomly selected adults,find the mean number of adults who would have bank savings accounts.

An appliance manufacturer gives a warranty,and 95 percent of its appliances do not require repair before the warranty expires.An organization buys 10 of these appliances.Calculate an interval that contains 95.44 percent of all the appliances that will not require repair.

Using the following probability distribution table of the random variable x,what is the probability of x = 3?

The Securities and Exchange Commission has determined that the number of companies listed on the NYSE declaring bankruptcy is approximately a Poisson distribution with a mean of 2.6 per month.Find the probability that more than 1 bankruptcy occurs next month.

A correlation coefficient is a unitless measure of the linear relationship between two random variables.

The Securities and Exchange Commission has determined that the number of companies listed on the NYSE declaring bankruptcy is approximately a Poisson distribution with a mean of 2.6 per month.Find the probability that no more than one bankruptcy occurs next month.

The J.O.Supplies Company buys calculators from a non-US supplier.The probability of a defective calculator is 10 percent.If 10 calculators are selected at random,what is the probability that 3 or more of the calculators will be defective?

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

A hypergeometric random variable x has a distribution that is approximated by a binomial distribution when

A discrete probability distribution is expressed as a table,graph,or ___________ that gives the probability associated with each possible value that the random variable can assume.

The time (in seconds)it takes for an athlete to run 50 meters is an example of a continuous random variable.

Which of the following is not a discrete random variable?

The requirement that the probability of success remains constant from trial to trial is a property of the _________________ distribution.

If the population size is at least 20 times larger than the sample size,a hypergeometric distribution can be approximated by the binomial distribution.

A study conducted by a local university found that 25 percent of college freshmen support increased spending on environmental issues.If 6 college freshmen are randomly selected,find the probability that exactly 3 support increased spending on environmental issues.

The probability distribution of a random variable that is defined to be the number of successes obtained in a random sample selected without replacement from a finite population of N elements that contains r successes and N − r failures is

In a binomial distribution,the random variable X is continuous.

Of all individual tax returns,37 percent include errors made by the taxpayer.If IRS examiners are assigned randomly selected returns in batches of 12,find the mean and standard deviation for the number of erroneous returns per batch.

The number of ways to arrange x successes among n trials is equal to

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 for Means and Proportions

Statistical Inferences for Population Variances

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Time Series Forecasting and Index Numbers

Nonparametric Methods

Decision Theory

Filters

Exam 5: Discrete Random Variables

A random variable

According to a survey of adults,64 percent have money in a bank savings account.If we were to survey 50 randomly selected adults,find the mean number of adults who would have bank savings accounts.

An appliance manufacturer gives a warranty,and 95 percent of its appliances do not require repair before the warranty expires.An organization buys 10 of these appliances.Calculate an interval that contains 95.44 percent of all the appliances that will not require repair.

Using the following probability distribution table of the random variable x,what is the probability of x = 3?

The Securities and Exchange Commission has determined that the number of companies listed on the NYSE declaring bankruptcy is approximately a Poisson distribution with a mean of 2.6 per month.Find the probability that more than 1 bankruptcy occurs next month.

A correlation coefficient is a unitless measure of the linear relationship between two random variables.

The Securities and Exchange Commission has determined that the number of companies listed on the NYSE declaring bankruptcy is approximately a Poisson distribution with a mean of 2.6 per month.Find the probability that no more than one bankruptcy occurs next month.

The J.O.Supplies Company buys calculators from a non-US supplier.The probability of a defective calculator is 10 percent.If 10 calculators are selected at random,what is the probability that 3 or more of the calculators will be defective?

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

A hypergeometric random variable x has a distribution that is approximated by a binomial distribution when

A discrete probability distribution is expressed as a table,graph,or ___________ that gives the probability associated with each possible value that the random variable can assume.

The time (in seconds)it takes for an athlete to run 50 meters is an example of a continuous random variable.

Which of the following is not a discrete random variable?

The requirement that the probability of success remains constant from trial to trial is a property of the _________________ distribution.

If the population size is at least 20 times larger than the sample size,a hypergeometric distribution can be approximated by the binomial distribution.

A study conducted by a local university found that 25 percent of college freshmen support increased spending on environmental issues.If 6 college freshmen are randomly selected,find the probability that exactly 3 support increased spending on environmental issues.

The probability distribution of a random variable that is defined to be the number of successes obtained in a random sample selected without replacement from a finite population of N elements that contains r successes and N − r failures is

In a binomial distribution,the random variable X is continuous.

Of all individual tax returns,37 percent include errors made by the taxpayer.If IRS examiners are assigned randomly selected returns in batches of 12,find the mean and standard deviation for the number of erroneous returns per batch.

The number of ways to arrange x successes among n trials is equal to

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 for Means and Proportions

Statistical Inferences for Population Variances

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Time Series Forecasting and Index Numbers

Nonparametric Methods

Decision Theory

Filters