1.) The height of a continuous probability curve over a given point is equal to:

the mean

the standard deviation

zero

Z

2.) The mean and median are the same for a normal distribution.

True

False

3.) In a statistical study, the random variable X = 1, if the house is colonial, and X = 0 if the house is not colonial, then it can be stated that the random variable is continuous.

True

False

4.) The actual weight of hamburger patties is an example of a continuous random variable.

True

False

5.) For a continuous distribution, P(X ≤ 100) = P(X < 100).

True

False

6.) A standard normal distribution has a mean of ____ and standard deviation of ___.

zero, zero

zero, one

one, one

one, zero

7.) Which two distributions are useful in analyzing queues?

Binomial and normal

Normal and exponential

Poisson and normal

Poisson and exponential

8.) The area under the normal curve between z = 0 and z = 1 is _________ the area under the normal curve between z = 1 and z = 2.

less than

greater than

equal to

A, B, or C above depending on the value of the mean

A, B, or C above depending on the value of the standard deviation

9.) If a random variable x has a uniform distribution with a mean of 10 and the lowest value of x is 5, what is the largest value of x that can exist?

5

15

10

20

10.) The price-to-earning ratio for firms in a given industry is distributed according to a normal distribution. In this industry, a firm with a Z value equal to 1:

has an above average price-to-earning ratio.

has a below average price-to-earnings ratio.

has an average price-to-earnings ratio.

may have an above average or below average price-to-earnings ratio.

11.) A student’s grade on an examination was transformed to a z value which is negative. Therefore, we know that he scored:

higher than 16% of the class.

higher than 45% of the class.

above the first quartile.

below the mean.

above the mean but below the median.

12.) The MPG (mileage per gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be less than 33.2?

43.32%

6.68%

93.32%

86.64%

13.36%

13.) The number of standard deviations that a value x if from the mean is:

normal.

exponential.

uniform.

z-score.

14.) A uniform distribution has the following shape:

Bell-shaped

Rectangular

Normal

Bi-model

15.) A methodology that attempts to determine the number of servers that strikes an optimal balance between the time customers wait for service and the cost of providing service is:

Queueing theory.

Exponential theory.

Optimization theory.

Normal distribution.

Uniform distribution.