# Qnt 561

1) Which level of measurement is required for the median?
| A. | | Ordinal |
| B. | | Ratio |
| C. | | Nominal |
| D. | | Interval |

2) The weighted mean is a special case of the:
| A. | | Median |
| B. | | Geometric mean |
| C. | | Mean |
| D. | | Mode |

3) A difference between calculating the sample mean and the population mean is:
| A. | | We divide the sum of the observations by n - 1 instead of n |
| B. | | There are no differences. |
| C. | | Only in the symbols, we use instead of µ and n instead of N. |
| D. | | The observations are ranked and select the middle value for the population mean. |

4) The mean and the variance are equal in
| A. | | The binomial distribution. |
| B. | | The hypergeometric distribution. |
| C. | | All probability distributions. |
| D. | | The Poisson distribution. |

5) The difference between a random variable and a probability distribution is:
| A. | | A random variable does not include the probability of an event. |
| B. | | A random variable can only assume whole numbers. |
| C. | | A probability distribution can only assume whole numbers. |
| D. | | None of the above. |

6) In which of the following distributions is the probability of a success usually small?
| A. | | Poisson |
| B. | | All distribution |
| C. | | Binomial |
| D. | | Hypergeometric |
7) A sample |
| A. | | Is part of the population. |
| B. | | Has more than 30 observations. |
| C. | | Is usually identified as N. |
| D. | | All of these |
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8) Suppose a population consisted of 20 items. How many different samples of n = 3 are possible? |
| A. | | 1140 |
| B. | | 120 |
| C. | | 6840 |
| D. | | 20 |
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9) The difference between the sample mean and the population mean is called the |
| A. | | Population standard deviation. |
| B. | | Sampling error. |
| C. | | Population mean. |
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