Question 1

Asymptotic means that the normal curve gets closer and closer to the X-axis but never actually touches it.

Accepted Answer

A) True 
 B)False  True

Question 2

What is the formula to convert any normal distribution to the standard normal distribution? _______________________

Accepted Answer

z = (X - $\mu$)/$\sigma$

Question 3

One of the properties of the normal curve is that it gets closer to the horizontal axis,but never touches it.What is this property of the normal curve called? _________________

Accepted Answer

Asymptotic

Question 4

Some normal probability distributions have equal arithmetic means,but their standard deviations may be different.

Accepted Answer

A) True 
 B)False

Question 5

An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours.The distribution of the lives approximated a normal distribution.The standard deviation of the distribution was 1.2 hours.About 95.44 percent of the batteries failed between what two values?

Accepted Answer

A) 8.9 and 18.9 
B) 12.2 and 14.2 
C) 14.1 and 22.1 
D) 16.6 and 21.4 
A) 8.9 and 18.9 
B) 12.2 and 14.2 
C) 14.1 and 22.1 
D) 16.6 and 21.4

Question 6

What does a z value of -2.00 indicate about the corresponding X value? _______________________

Accepted Answer

Less than or to the

Question 7

Suppose a tire manufacturer wants to set a mileage guarantee on its new XB 70 tire.Tests revealed that the tire's mileage is normally distributed with a mean of 47,900 miles and a standard deviation of 2,050 miles.The manufacturer wants to set the guaranteed mileage so that no more than 5 percent of the tires will have to be replaced.What guaranteed mileage should the manufacturer announce?

Accepted Answer

A) 44,528 
B) 32,960 
C) 49,621 
D) 40,922 
A) 44,528 
B) 32,960 
C) 49,621 
D) 40,922

Question 8

The area under the normal curve within plus and minus one standard deviation of the mean is about 68.26%.

Accepted Answer

A) True 
 B)False

Question 9

Some normal probability distributions have different arithmetic means and different standard deviations.

Accepted Answer

A) True 
 B)False

Question 10

For a uniform probability distribution,the probability of any event is equal to 1/(b-a).

Accepted Answer

A) True 
 B)False

Question 11

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 12

A major credit card company has determined that customers charge between $100 and $1100 per month.Given that the average monthly amount charged is uniformly distributed,what percent of monthly charges are equal to $500? __________

Accepted Answer

Can calcul

Question 13

The mean amount of gasoline and services charged by Key Refining Company credit customers is $70 per month.The distribution of amounts spent is approximately normal with a standard deviation of $10.What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83?

Accepted Answer

A) 0.1962 
B) 0.4032 
C) 0.3413 
D) 0.4750 
A) 0.1962 
B) 0.4032 
C) 0.3413 
D) 0.4750

Question 14

The total area under the normal curve is 100%.

Accepted Answer

A) True 
 B)False

Question 15

What is the area under the normal curve between z = -1.0 and z = -2.0?

Accepted Answer

A) 0.0228 
B) 0.3413 
C) 0.1359 
D) 0.4772 
A) 0.0228 
B) 0.3413 
C) 0.1359 
D) 0.4772

Question 16

The total area within any continuous probability distribution is equal to 1.00.

Accepted Answer

A) True 
 B)False

Question 17

The Empirical Rule of probability can be applied to the uniform probability distribution.

Accepted Answer

A) True 
 B)False

Question 18

What is a normal distribution with a mean of 0 and a standard deviation of 1 called?

Accepted Answer

A) Frequency distribution 
B) Z-score 
C) Standard normal distribution 
D) Binomial probability distribution 
A) Frequency distribution 
B) Z-score 
C) Standard normal distribution 
D) Binomial probability distribution

Question 19

Which of the following is true in a normal distribution?

Accepted Answer

A) Mean equals the mode and the median 
B) Mode equals the median 
C) Mean divides the distribution into two equal parts 
D) All of the above are correct 
A) Mean equals the mode and the median 
B) Mode equals the median 
C) Mean divides the distribution into two equal parts 
D) All of the above are correct

Question 20

What is an important similarity between the uniform and normal probability distributions?

Accepted Answer

A) The mean,median and mode are all equal. 
B) The mean and median are equal. 
C) They are negatively skewed. 
D) About 68% of all observations are within one standard deviation of the mean. 
A) The mean,median and mode are all equal. 
B) The mean and median are equal. 
C) They are negatively skewed. 
D) About 68% of all observations are within one standard deviation of the mean.

Asymptotic means that the normal curve gets closer and closer to the X-axis but never actually touches it.

What is the formula to convert any normal distribution to the standard normal distribution? _______________________

One of the properties of the normal curve is that it gets closer to the horizontal axis,but never touches it.What is this property of the normal curve called? _________________

Some normal probability distributions have equal arithmetic means,but their standard deviations may be different.

What does a z value of -2.00 indicate about the corresponding X value? _______________________

The area under the normal curve within plus and minus one standard deviation of the mean is about 68.26%.

Some normal probability distributions have different arithmetic means and different standard deviations.

For a uniform probability distribution,the probability of any event is equal to 1/(b-a).

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

A major credit card company has determined that customers charge between $100 and $1100 per month.Given that the average monthly amount charged is uniformly distributed,what percent of monthly charges are equal to $500? __________

The total area under the normal curve is 100%.

What is the area under the normal curve between z = -1.0 and z = -2.0?

The total area within any continuous probability distribution is equal to 1.00.

The Empirical Rule of probability can be applied to the uniform probability distribution.

What is a normal distribution with a mean of 0 and a standard deviation of 1 called?

Which of the following is true in a normal distribution?

What is an important similarity between the uniform and normal probability distributions?

What Is Statistics

Describing Data: Frequency Distributions and Graphic Presentations

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

Linear Regression and Correlation

Multiple Regression and Correlation Analysis

Chi-Square Applications

Filters

Exam 7: Continuous Probability Distributions

Asymptotic means that the normal curve gets closer and closer to the X-axis but never actually touches it.

What is the formula to convert any normal distribution to the standard normal distribution? _______________________

One of the properties of the normal curve is that it gets closer to the horizontal axis,but never touches it.What is this property of the normal curve called? _________________

Some normal probability distributions have equal arithmetic means,but their standard deviations may be different.

What does a z value of -2.00 indicate about the corresponding X value? _______________________

The area under the normal curve within plus and minus one standard deviation of the mean is about 68.26%.

Some normal probability distributions have different arithmetic means and different standard deviations.

For a uniform probability distribution,the probability of any event is equal to 1/(b-a).

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

A major credit card company has determined that customers charge between $100 and $1100 per month.Given that the average monthly amount charged is uniformly distributed,what percent of monthly charges are equal to $500? __________

The total area under the normal curve is 100%.

What is the area under the normal curve between z = -1.0 and z = -2.0?

The total area within any continuous probability distribution is equal to 1.00.

The Empirical Rule of probability can be applied to the uniform probability distribution.

What is a normal distribution with a mean of 0 and a standard deviation of 1 called?

Which of the following is true in a normal distribution?

What is an important similarity between the uniform and normal probability distributions?

What Is Statistics

Describing Data: Frequency Distributions and Graphic Presentations

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

Linear Regression and Correlation

Multiple Regression and Correlation Analysis

Chi-Square Applications

Filters