Chapter03

Chapter03 - Chapter 3 Describing Data: Numerical Measures...

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Chapter 3 Describing Data: Numerical Measures True/False 1. A value that is typical or representative of the data is referred to as a measure of central location. Answer: True Difficulty: Easy Goal: 1 2. The arithmetic mean is the sum of the observations divided by the total number of observations. Answer: True Difficulty: Easy Goal: 1 3. For a set of data arranged or sorted in numerical order, the value of the observation in the center is called the weighted mean. Answer: False Difficulty: Easy Goal: 1 4. A set of ordinal, interval or ratio level data may only have one mode. Answer: False Difficulty: Easy Goal: 1 5. If a variable is measured at the interval or ratio level, all the values are included when computing the mean. Answer: True Difficulty: Easy Goal: 2 AACSB: EU 6. A variable measured at the interval or ratio level can have more than one arithmetic mean. Answer: False Difficulty: Easy Goal: 2 7. The mode is the value of the observation that appears most frequently. Answer: True Difficulty: Easy Goal: 1 8. A distribution that has the same shape on either side of the center is said to be symmetrical. Answer: True Difficulty: Easy Goal: 3 9. A negatively skewed distribution is not symmetrical. The long tail is to the left or in the negative direction. Answer: True Difficulty: Easy Goal: 3 10. The geometric mean is the nth root of n observations. Answer: True Difficulty: Medium Goal: 1 1
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11. A statistic is a measurable characteristic of the population. Answer: False Difficulty: Easy Goal: 1 12. A parameter is a measurable characteristic of a sample. Answer: False Difficulty: Easy Goal: 1 13. The median can be determined for any set of interval-level data. Answer: True Difficulty: Easy Goal: 2 14. Extremely high or low scores affect the value of the median. Answer: False Difficulty: Easy Goal: 2 15. The sum of the deviations from the mean for the set of numbers 4, 9 and 5 will equal zero. Answer: True Difficulty: Easy Goal: 2 16. For salaries of $102,000, $98,000, $45,000, $106,000 and $101,000, the arithmetic mean would be an appropriate average. Answer: False Difficulty: Easy Goal: 2 AACSB: REF 17. Three persons earn $8 an hour, six earn $9 an hour, and one earns $12 an hour. The weighted mean hourly wage is $9. Answer: True Difficulty: Medium Goal: 1 AACSB: AS 18. For any distribution, there are an equal number of values above the mean and below it. Answer: False Difficulty: Easy Goal: 2 19. For a data set with an even number of ungrouped values, the median is the arithmetic mean of the two middle values. Answer: True Difficulty: Easy Goal: 1 20. For a data set with an even number of ungrouped values, half of the values will be less than the median. Answer: True
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This note was uploaded on 04/23/2011 for the course EC 315 taught by Professor Barcus during the Spring '10 term at Park.

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Chapter03 - Chapter 3 Describing Data: Numerical Measures...

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