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| 1.
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The height of a continuous probability curve over a given point is |
| | A) | Equal to the mean |
| | B) | Equal to the standard deviation |
| | C) | Equal to zero |
| | D) | Equal to Z |
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| 2.
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A standard normal distribution has a mean of __________ and standard deviation of _______ |
| | A) | zero, zero. |
| | B) | zero, one. |
| | C) | one, one. |
| | D) | one, zero. |
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| 3.
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Which two distributions are useful in analyzing queues? |
| | A) | Binomial and normal |
| | B) | Normal and exponential |
| | C) | Poisson and normal |
| | D) | Poisson and exponential |
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| 4.
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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 |
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| 5.
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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 |
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| 6.
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The price-to-earning ratio for firms in a given industry is distributed according to 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. |
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| 7.
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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. |
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| 8.
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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% |
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| 9.
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The mean and median are the same for a normal distribution. |
| | A) | True |
| | B) | False |
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| 10.
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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 |
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| 11.
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The actual weight of hamburger patties is an example of a continuous random variable. |
| | A) | True |
| | B) | False |
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| 12.
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For a continuous distribution, P(X ≤ 100) = P(X 100). |
| | A) | True |
| | B) | False |
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