Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

A Bernoulli process (each trial)has exactly ___ possible outcomes.

Accepted Answer

A) 8 
B) 4 
C) 2 
D) 1 
E) 6 
A) 8 
B) 4 
C) 2 
D) 1 
E) 6

Question 3

A market research team compiled the following discrete probability distribution.In this distribution x represents the number of automobiles owned by a family.   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 is a normal distribution. 
D) This distribution is skewed to the left. 
E) This distribution is bimodal. 
A) This distribution is skewed to the right. 
B) This is a binomial distribution. 
C) This is a normal distribution. 
D) This distribution is skewed to the left. 
E) This distribution is bimodal.

Question 4

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, 2013.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) 0.2000 
A) 0.8171 
B) 0.1074 
C) 0.8926 
D) 0.3020 
E) 0.2000

Question 5

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 6

Aluminum castings are processed in lots of five each.A sample of two castings is randomly selected from each lot for inspection.A particular lot contains one defective casting; and x is the number of defective castings in the sample.P(x=1)is ___.

Accepted Answer

A) 0.2 
B) 0.4 
C) 0.6 
D) 0.8 
E) 1.0 
A) 0.2 
B) 0.4 
C) 0.6 
D) 0.8 
E) 1.0

Question 7

A variable that can take on values at any point over a given interval is called a discrete random variable.

Accepted Answer

A) True 
 B)False

Question 8

The number of cars arriving at a toll booth in five-minute intervals is Poisson distributed with a mean of 3 cars arriving in five-minute time intervals.The probability of 3 cars arriving over a five-minute interval is ___.

Accepted Answer

A) 0.2700 
B) 0.0498 
C) 0.2240 
D) 0.0001 
E) 0.0020 
A) 0.2700 
B) 0.0498 
C) 0.2240 
D) 0.0001 
E) 0.0020

Question 9

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 10

A fair coin is tossed 5 times.What is the probability that exactly 2 heads are observed?

Accepted Answer

A) 0.313 
B) 0.073 
C) 0.400 
D) 0.156 
E) 0.250 
A) 0.313 
B) 0.073 
C) 0.400 
D) 0.156 
E) 0.250

Question 11

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 12

You are offered an investment opportunity.Its outcomes and probabilities are presented in the following table:   The standard deviation of this distribution is ___.

Accepted Answer

A) -$400 
B) $663 
C) $800,000 
D) $894 
E) $2000 
A) -$400 
B) $663 
C) $800,000 
D) $894 
E) $2000

Question 13

As in a binomial distribution, successive trials of a hypergeometric distribution are independent.

Accepted Answer

A) True 
 B)False

Question 14

The hypergeometric distribution is similar to the binomial distribution except that ___.

Accepted Answer

A) sampling is done with replacement in the hypergeometric 
B) sampling is done without replacement in the hypergeometric 
C) x does not represent the number of successes in the hypergeometric 
D) there are more than two possible outcomes in the hypergeometric 
A) sampling is done with replacement in the hypergeometric 
B) sampling is done without replacement in the hypergeometric 
C) x does not represent the number of successes in the hypergeometric 
D) there are more than two possible outcomes in the hypergeometric

Question 15

A market research team compiled the following discrete probability distribution.In this distribution x represents the number of automobiles owned by a family.   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

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

A Bernoulli process (each trial)has exactly ___ possible outcomes.

A market research team compiled the following discrete probability distribution.In this distribution x represents the number of automobiles owned by a family. Which of the following statements is true?

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

Aluminum castings are processed in lots of five each.A sample of two castings is randomly selected from each lot for inspection.A particular lot contains one defective casting; and x is the number of defective castings in the sample.P(x=1)is ___.

A variable that can take on values at any point over a given interval is called a discrete random variable.

The number of cars arriving at a toll booth in five-minute intervals is Poisson distributed with a mean of 3 cars arriving in five-minute time intervals.The probability of 3 cars arriving over a five-minute interval is ___.

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 ___.

A fair coin is tossed 5 times.What is the probability that exactly 2 heads are observed?

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 ___.

You are offered an investment opportunity.Its outcomes and probabilities are presented in the following table: The standard deviation of this distribution is ___.

As in a binomial distribution, successive trials of a hypergeometric distribution are independent.

The hypergeometric distribution is similar to the binomial distribution except that ___.

A market research team compiled the following discrete probability distribution.In this distribution x represents the number of automobiles owned by a family. The mean (average)value of x is ___.

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

Analysis 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

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Exam 5: Discrete Distributions

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

A Bernoulli process (each trial)has exactly ___ possible outcomes.

A market research team compiled the following discrete probability distribution.In this distribution x represents the number of automobiles owned by a family. Which of the following statements is true?

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

Aluminum castings are processed in lots of five each.A sample of two castings is randomly selected from each lot for inspection.A particular lot contains one defective casting; and x is the number of defective castings in the sample.P(x=1)is ___.

A variable that can take on values at any point over a given interval is called a discrete random variable.

The number of cars arriving at a toll booth in five-minute intervals is Poisson distributed with a mean of 3 cars arriving in five-minute time intervals.The probability of 3 cars arriving over a five-minute interval is ___.

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 ___.

A fair coin is tossed 5 times.What is the probability that exactly 2 heads are observed?

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 ___.

You are offered an investment opportunity.Its outcomes and probabilities are presented in the following table: The standard deviation of this distribution is ___.

As in a binomial distribution, successive trials of a hypergeometric distribution are independent.

The hypergeometric distribution is similar to the binomial distribution except that ___.

A market research team compiled the following discrete probability distribution.In this distribution x represents the number of automobiles owned by a family. The mean (average)value of x is ___.

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

Analysis 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