Question 1

The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. What is the area between 415 pounds and the mean of 400 pounds?

Accepted Answer

A)  0.5000 
B)  0.1932 
C)  0.4332 
D)  0.3413 
A)  0.5000 
B)  0.1932 
C)  0.4332 
D)  0.3413

Question 2

An analysis of the grades on the first test in History 101 revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award the grade of A to the upper 10 percent of the test grades. What is the dividing point between an A and a B grade?

Accepted Answer

A)  80 
B)  85 
C)  90 
D)  95 
A)  80 
B)  85 
C)  90 
D)  95

Question 3

A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. What is the income that separates the top 25% from the lower 75% of the incomes?

Accepted Answer

range of $

Question 4

How is the expected value of a uniform distribution computed? __________

Accepted Answer

The answer of How is the expected value of a...

Question 5

What is the area under the normal curve between z = 0.0 and z = 2.0?

Accepted Answer

A)  1.0000 
B)  0.7408 
C)  0.1359 
D)  0.4772 
A)  1.0000 
B)  0.7408 
C)  0.1359 
D)  0.4772

Question 6

The standard normal distribution is a special normal distribution with a mean of 0 and a standard deviation of 1.

Accepted Answer

A) True 
 B)False

Question 7

For normally distributed random variables, what rule makes probability statements based on specific values of the standard deviation? ___________

Accepted Answer

The answer of For normally distributed random variables, what rule...

Question 8

A study of a company's practice regarding the payment of invoices revealed that an invoice was paid an average of 20 days after it was received. The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?

Accepted Answer

A)  15.87% 
B)  37.91% 
C)  34.13% 
D)  86.74% 
A)  15.87% 
B)  37.91% 
C)  34.13% 
D)  86.74%

Question 9

To apply the normal approximation to a binomial distribution, mean and variance are ________

Accepted Answer

The answer of To apply the normal approximation to a...

Question 10

The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is more than 140 minutes?

Accepted Answer

A)  1.00 
B)  0.5 
C)  0.333 minutes 
D)  10 minutes 
A)  1.00 
B)  0.5 
C)  0.333 minutes 
D)  10 minutes

Question 11

Management is considering adopting a bonus system to increase production. One suggestion is to pay a bonus on the highest 5 percent of production based on past experience. Past records indicate that, on the average, 4,000 units of a small assembly are produced during a week. The distribution of the weekly production is approximately normally distributed with a standard deviation of 60 units. If the bonus is paid on the upper 5 percent of production, the bonus will be paid on how many units or more?

Accepted Answer

A)  6255 
B)  5120 
C)  3196 
D)  4099 
A)  6255 
B)  5120 
C)  3196 
D)  4099

The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. What is the area between 415 pounds and the mean of 400 pounds?

An analysis of the grades on the first test in History 101 revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award the grade of A to the upper 10 percent of the test grades. What is the dividing point between an A and a B grade?

A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. What is the income that separates the top 25% from the lower 75% of the incomes?

How is the expected value of a uniform distribution computed? __________

What is the area under the normal curve between z = 0.0 and z = 2.0?

The standard normal distribution is a special normal distribution with a mean of 0 and a standard deviation of 1.

For normally distributed random variables, what rule makes probability statements based on specific values of the standard deviation? ___________

A study of a company's practice regarding the payment of invoices revealed that an invoice was paid an average of 20 days after it was received. The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?

To apply the normal approximation to a binomial distribution, mean and variance are ________

The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is more than 140 minutes?

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Numerical Measures

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Correlation and Linear Regression

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters

Exam 7: Continuous Probability Distributions

The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. What is the area between 415 pounds and the mean of 400 pounds?

An analysis of the grades on the first test in History 101 revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award the grade of A to the upper 10 percent of the test grades. What is the dividing point between an A and a B grade?

A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. What is the income that separates the top 25% from the lower 75% of the incomes?

How is the expected value of a uniform distribution computed? __________

What is the area under the normal curve between z = 0.0 and z = 2.0?

The standard normal distribution is a special normal distribution with a mean of 0 and a standard deviation of 1.

For normally distributed random variables, what rule makes probability statements based on specific values of the standard deviation? ___________

A study of a company's practice regarding the payment of invoices revealed that an invoice was paid an average of 20 days after it was received. The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?

To apply the normal approximation to a binomial distribution, mean and variance are ________

The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is more than 140 minutes?

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Numerical Measures

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Correlation and Linear Regression

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters