MBA5008 Week 1: Chapter 3 and 4 Homework
- You roll a fair six-sided die with the hopes of rolling a 5 or a 6. These two events are ___________ because they have no sample points in common.
| | | | c. mutually exclusive events | |
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- The mean of a sample is _____.
| a. computed by summing the data values and dividing the sum by (n − 1) | |
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| b. computed by summing all the data values and dividing the sum by the number of items | |
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| c. always equal to the mean of the population | |
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| d. always smaller than the mean of the population |
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- If a data set has an even number of observations, the median _____.
| a. must be equal to the mean | |
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| c. is the observation recorded most often | |
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| d. is the average value of the two middle items when all items are arranged in ascending order |
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- The “Top Three” at a racetrack consists of picking the correct order of the first three horses in a race. If there are 10 horses in a particular race, how many “Top Three” outcomes are there?
- If two events are independent, then _____.
| a. they must be mutually exclusive | |
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| b. the sum of their probabilities must be equal to 1 | |
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| c. the probability of their intersection must be 0 | |
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| d. None of these answers are correct |
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- Given that event Ehas a probability of .25, the probability of the complement of event E
| a. cannot be determined with the above information. | |
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| b. can have any value between 0 and 1 | |
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- The _____ denotes the number of standard deviations xiis from the mean x̄.
- Which of the following depicts a moderately left-skewed distribution?
a.
b.
c.
d.
- The symbol ∪ indicates the _____.
a. intersection of events | |
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| b. sum of the probabilities of events | |
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- Excel’s _____ function can be used to compute the population variance.
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| d. None of these answers are correct. |
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11.
- Consider a sample with a mean of and a standard deviation of . Use Chebyshev’s theorem to determine the percentage of the data within each of the following ranges (to the nearest whole number).
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