1. Question : When using the Chebyshev's theorem to obtain the bounds for 99.73 percent of the values in a population, the interval generally will be _______ the interval obtained for the same percentage if normal distribution is assumed (empirical rule).

• narrower than
• wider than
• the same as

2. Question : An example of a qualitative variable is the mileage of a car.

• True
• False

3. Question : By taking a systematic sample, in which we select every 100th shopper arriving at a specific store, we are approximating a random sample of shoppers.

• True
• False

4. Question : All of the following are measures of central tendency except the

• range
• mode
• mean
• median

5. Question : Measurements from a population are called

• statistics.
• observations.
• variables.
• inferences.

6. Question : A normal population has 99.73 percent of the population measurements within ___ standard deviations of the mean.

• one
• two
• three
• four

7. Question : When a population is skewed to the left or right with a very long tail, what is the best measure to use for central tendency.

• Population mean
• Population mode
• Population median
• Population standard deviation

8. Question : All of the following are measures of central tendency except the

• range
• mode
• mean
• median

9. Question : Which percentile describes the first quartile Q1?

• 25th
• 50th
• 75th
• 100th

10. Question : Any characteristic of a population unit is called a

• measurement.
• sample.
• observation.
• variable.