Question 1

For a standard normal distribution, what is the probability that z is greater than 1.75?

Accepted Answer

A)  0.0401 
B)  0.0459 
C)  0.4599 
D)  0.9599 
E)  None of the choices are correct 
A)  0.0401 
B)  0.0459 
C)  0.4599 
D)  0.9599 
E)  None of the choices are correct

Question 2

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports).

-The student from Section ______scored better compared to the rest of their section.

Accepted Answer

student fr

Question 3

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces.
-The probability that a loaf of bread is > 21 ounces is ______.

Accepted Answer

The answer of A loaf of bread is normally distributed...

Question 4

The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $37,200 and a standard deviation of $800. About 68 percent of the incomes lie between what two incomes?

Accepted Answer

A)  $30,000 and $40,000 
B)  $36,400 and $38,000 
C)  $34,800 and $39,600 
D)  $35,600 and $38,800 
E)  None of the choices are correct 
A)  $30,000 and $40,000 
B)  $36,400 and $38,000 
C)  $34,800 and $39,600 
D)  $35,600 and $38,800 
E)  None of the choices are correct

Question 5

The normal distribution is a(n) ______probability distribution.

Accepted Answer

The answer of The normal distribution is a(n) ______probability distribution....

Question 6

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces.
-The probability that a loaf of bread is > 23 ounces is______ .

Accepted Answer

The answer of A loaf of bread is normally distributed...

Question 7

What is the area under the normal curve between z = 0.0 and z = 1.79?

Accepted Answer

A)  0.4633 
B)  0.0367 
C)  0.9599 
D)  0.0401 
E)  None of the choices are correct 
A)  0.4633 
B)  0.0367 
C)  0.9599 
D)  0.0401 
E)  None of the choices are correct

Question 8

A study of a company's practice regarding the payment of invoices revealed that on the average an invoice was paid 20 days after it was received. The standard deviation equalled 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% 
E)  None of the choices are correct 
A)  15.87% 
B)  37.91% 
C)  34.13% 
D)  86.74% 
E)  None of the choices are correct

Question 9

The upper and lower limits of a uniform probability distribution are

Accepted Answer

A)  positive and negative infinity. 
B)  plus and minus three standard deviations. 
C)  0 and 1. 
D)  the maximum and minimum values of the random variable. 
A)  positive and negative infinity. 
B)  plus and minus three standard deviations. 
C)  0 and 1. 
D)  the maximum and minimum values of the random variable.

Question 10

Determine the z-score associated with an area of .1950 from the mean of a normal distribution to that positive z-score.

Accepted Answer

A)  0.41 
B)  0.51 
C)  0.5 
D)  0.01 
E)  -0.41 
A)  0.41 
B)  0.51 
C)  0.5 
D)  0.01 
E)  -0.41

Question 11

A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000.

-_______students earned between $27,000 and $33,000?

Accepted Answer

The answer of A sample of 500 evening students revealed...

Question 12

Which of the following is NOT true regarding the normal distribution?

Accepted Answer

A)  Mean, median and mode are all equal 
B)  It has a single peak 
C)  It is symmetrical 
D)  The points of the curve meet the X-axis at z = -3 and z = 3 
E)  None of the choices are correct 
A)  Mean, median and mode are all equal 
B)  It has a single peak 
C)  It is symmetrical 
D)  The points of the curve meet the X-axis at z = -3 and z = 3 
E)  None of the choices are correct

Question 13

A major credit card company has determined that customers charge between $100 and $1,100 per month. Given that the average monthly amount charged is uniformly distributed, what is the standard deviation of the monthly amount charged?

Accepted Answer

A)  298.67 
B)  275.57 
C)  267.88 
D)  288.67 
E)  None of the choices are correct 
A)  298.67 
B)  275.57 
C)  267.88 
D)  288.67 
E)  None of the choices are correct

Question 14

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces.

-The probability that a loaf of bread is < 20 ounces is______ .

Accepted Answer

The answer of A loaf of bread is normally distributed...

Question 15

Which of the following is NOT a characteristic of the normal probability distribution?

Accepted Answer

A)  Positively-skewed 
B)  Bell-shaped 
C)  Symmetrical 
D)  Asymptotic 
E)  All of the choices are correct 
A)  Positively-skewed 
B)  Bell-shaped 
C)  Symmetrical 
D)  Asymptotic 
E)  All of the choices are correct

Question 16

i. In terms of a formula the standardized value of z is found by z = (X - µ)/?. 
ii. The standard normal distribution is a special normal distribution with a mean of 0 and a standard deviation of 1.
Iii) A computed z for X values to the right of the mean is positive.

Accepted Answer

A)  (i), (ii) and (iii) are all correct statements 
B)  (i) is a correct statement but not (ii) or (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (i) and, (ii) are correct statements but not (iii). 
E)  All statements are false 
A)  (i), (ii) and (iii) are all correct statements 
B)  (i) is a correct statement but not (ii) or (iii). 
C)  (i) and, (iii) are correct statements but not (ii). 
D)  (i) and, (ii) are correct statements but not (iii). 
E)  All statements are false

Question 17

Determine the z-score associated with an area of 0.4925 from the mean of a normal distribution to that negative z-score.

Accepted Answer

A)  2.43 
B)  -2.43 
C)  -2.4 
D)  2.4 
E)  -2.44 
A)  2.43 
B)  -2.43 
C)  -2.4 
D)  2.4 
E)  -2.44

Question 18

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports).

-The replacement time that separated the top 20% from the bottom 80% is______ years.

Accepted Answer

The answer of Replacement times for TV sets are normally...

Question 19

A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $50,000 and a standard deviation of $4,000. What is the income that separates the top
25% from the lower 75% of the incomes?

Accepted Answer

A)  $2,680 
B)  $47,320 
C)  $50,000 
D)  $52,680 
E)  None of the choices are correct 
A)  $2,680 
B)  $47,320 
C)  $50,000 
D)  $52,680 
E)  None of the choices are correct

Question 20

The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 400, the standard deviation 50. What is the area under the normal curve between 400 and 482?

Accepted Answer

A)  0.5000 
B)  0.4495 
C)  0.3413 
D)  0.4750 
E)  None of the choices are correct 
A)  0.5000 
B)  0.4495 
C)  0.3413 
D)  0.4750 
E)  None of the choices are correct

For a standard normal distribution, what is the probability that z is greater than 1.75?

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports). -The student from Section ______scored better compared to the rest of their section.

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces. -The probability that a loaf of bread is > 21 ounces is ______.

The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $37,200 and a standard deviation of $800. About 68 percent of the incomes lie between what two incomes?

The normal distribution is a(n) ______probability distribution.

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces. -The probability that a loaf of bread is > 23 ounces is______ .

What is the area under the normal curve between z = 0.0 and z = 1.79?

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

The upper and lower limits of a uniform probability distribution are

Determine the z-score associated with an area of .1950 from the mean of a normal distribution to that positive z-score.

A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. -_______students earned between $27,000 and $33,000?

Which of the following is NOT true regarding the normal distribution?

A major credit card company has determined that customers charge between $100 and $1,100 per month. Given that the average monthly amount charged is uniformly distributed, what is the standard deviation of the monthly amount charged?

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces. -The probability that a loaf of bread is < 20 ounces is______ .

Which of the following is NOT a characteristic of the normal probability distribution?

i. In terms of a formula the standardized value of z is found by z = (X - µ)/?. ii. The standard normal distribution is a special normal distribution with a mean of 0 and a standard deviation of 1. Iii) A computed z for X values to the right of the mean is positive.

Determine the z-score associated with an area of 0.4925 from the mean of a normal distribution to that negative z-score.

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports). -The replacement time that separated the top 20% from the bottom 80% is______ years.

A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $50,000 and a standard deviation of $4,000. What is the income that separates the top 25% from the lower 75% of the incomes?

The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 400, the standard deviation 50. What is the area under the normal curve between 400 and 482?

What Is Statistics

Describing Data: Frequency Distributions and Graphic Presentation

Describing Data: Numerical Measures

A Survey of Probability Concepts

Discrete Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of a Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Linear Regression and Correlation

Multiple Regression and Correlation Analysis

Chi-Square Applications for Nominal Data

Index Numbers

Time Series and Forecasting

An Introduction to Decision Theory

Filters

Exam 6: The Normal Probability Distribution

For a standard normal distribution, what is the probability that z is greater than 1.75?

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports). -The student from Section ______scored better compared to the rest of their section.

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces. -The probability that a loaf of bread is > 21 ounces is ______.

The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $37,200 and a standard deviation of $800. About 68 percent of the incomes lie between what two incomes?

The normal distribution is a(n) ______probability distribution.

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces. -The probability that a loaf of bread is > 23 ounces is______ .

What is the area under the normal curve between z = 0.0 and z = 1.79?

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

The upper and lower limits of a uniform probability distribution are

Determine the z-score associated with an area of .1950 from the mean of a normal distribution to that positive z-score.

A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. -_______students earned between $27,000 and $33,000?

Which of the following is NOT true regarding the normal distribution?

A major credit card company has determined that customers charge between $100 and $1,100 per month. Given that the average monthly amount charged is uniformly distributed, what is the standard deviation of the monthly amount charged?

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces. -The probability that a loaf of bread is < 20 ounces is______ .

Which of the following is NOT a characteristic of the normal probability distribution?

i. In terms of a formula the standardized value of z is found by z = (X - µ)/?. ii. The standard normal distribution is a special normal distribution with a mean of 0 and a standard deviation of 1. Iii) A computed z for X values to the right of the mean is positive.

Determine the z-score associated with an area of 0.4925 from the mean of a normal distribution to that negative z-score.

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports). -The replacement time that separated the top 20% from the bottom 80% is______ years.

A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $50,000 and a standard deviation of $4,000. What is the income that separates the top 25% from the lower 75% of the incomes?

The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 400, the standard deviation 50. What is the area under the normal curve between 400 and 482?

What Is Statistics

Describing Data: Frequency Distributions and Graphic Presentation

Describing Data: Numerical Measures

A Survey of Probability Concepts

Discrete Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of a Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Linear Regression and Correlation

Multiple Regression and Correlation Analysis

Chi-Square Applications for Nominal Data

Index Numbers

Time Series and Forecasting

An Introduction to Decision Theory

Filters