Questins

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

a)      the mean

b)      the standard deviation

c)       zero

d)      Z

e)      6.66/100

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

a)      True

b)      False

c)       6.66/100

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.

a)      True

b)      False

c)       6.66/100

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

a)      True

b)      False

c)       6.66/100

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

a)      True

b)      False

c)       6.66/100

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

a)      zero, zero

b)      zero, one

c)       one, one

d)      one, zero

e)      6.67/100

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

a)      Binomial and normal

b)      Normal and exponential

c)       Poisson and normal

d)      Poisson and exponential

e)      6.67/100

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.

a)      less than

b)      greater than

c)       equal to

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

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

f)       6.67/100

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?

a)      5

b)      15

c)       10

d)      20

e)      6.67/100

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:

a)      has an above average price-to-earning ratio.

b)      has a below average price-to-earnings ratio.

c)       has an average price-to-earnings ratio.

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

e)      6.67/100

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

a)      higher than 16% of the class.

b)      higher than 45% of the class.

c)       above the first quartile.

d)      below the mean.

e)      above the mean but below the median.

f)       6.67/100

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?

a)      43.32%

b)      6.68%

c)       93.32%

d)      86.64%

e)      13.36%

f)       6.67/100

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

a)      normal.

b)      exponential.

c)       uniform.

d)      z-score.

e)      6.67/100

14.)        A uniform distribution has the following shape:

a)      Bell-shaped

b)      Rectangular

c)       Normal

d)      Bi-model

e)      6.67/100

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:

a)      Queueing theory.

b)      Exponential theory.

c)       Optimization theory.

d)      Normal distribution.

e)      Uniform distribution.