QNT 275 Week 4 Quiz

Chapter 06, Testbank, Question 001

Your answer is correct.

A continuous random variable is a random variable that can:

assume no continuous random frequency

assume any value in one or more intervals

have no random sample

assume only a countable set of values

Chapter 06, Testbank, Question 009

Your answer is correct.

Which of the following is not a characteristic of the normal distribution?

The value of the mean is always greater than the value of the standard deviation

The curve is symmetric about the mean

The two tails of the curve extend indefinitely

The total area under the curve is 1.0

Chapter 06, Testbank, Question 010

Your answer is correct.

The total area under a normal distribution curve to the left of the mean is always:

greater than .5

equal to zero

equal to 1

equal to 0.5

Chapter 06, Testbank, Question 015

Your answer is correct.

For the standard normal distribution, the mean is:

1 and the standard deviation is 1

0.5 and the standard deviation is 0.5

1 and the standard deviation is zero

zero and the standard deviation is 1

Chapter 06, Testbank, Question 020

Your answer is correct.

For the standard normal distribution, the area between z = 0 and z = 2.94, rounded to four decimal places, is:

the tolerance is +/-2%

Chapter 06, Testbank, Question 023

Your answer is correct.

For the standard normal distribution, the area to the right of z = -2.12, rounded to four decimal places, is:

the tolerance is +/-2%

Chapter 06, Testbank, Question 026

Your answer is correct.

For the standard normal distribution, the area between z = 0.24 and z = 1.03, rounded to four decimal places, is:

the tolerance is +/-2%

Chapter 06, Testbank, Question 033-035

The GMAT scores of all examinees who took that test this year produce a distribution that is approximately normal with a mean of 420 and a standard deviation of 34.

The probability that the score of a randomly selected examinee is between 400 and 480, rounded to four decimal places, is:

The probability that the score of a randomly selected examinee is less than 370, rounded to four decimal places, is:

The probability that the score of a randomly selected examinee is more than 530, rounded to four decimal places, is: