# Standard Deviation and Data

2964 Words Sep 26th, 2012 12 Pages
CHAPTER THREE
DESCRIPTIVE STATISTICS: NUMERICAL MEASURES

MULTIPLE CHOICE QUESTIONS

In the following multiple choice questions, circle the correct answer.

1. Which of the following provides a measure of central location for the data? a. standard deviation b. mean c. variance d. range Answer: b

2. A numerical value used as a summary measure for a sample, such as sample mean, is known as a a. population parameter b. sample parameter c. sample statistic d. population mean Answer: c

3. Since the population size is always larger than the sample size, then the sample statistic a. can never be larger than the population parameter b. can never be equal to the
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the 50th percentile c. the standard deviation d. the interquartile range Answer: b

22. The interquartile range is used as a measure of variability to overcome what difficulty of the range? a. the sum of the range variances is zero b. the range is difficult to compute c. the range is influenced too much by extreme values d. the range is negative Answer: c

23. If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true? a. the data set is a sample b. the data set is a population c. the data set could be either a sample or a population d. the data set is from a census Answer: a

24. In computing descriptive statistics from grouped data, a. data values are treated as if they occur at the midpoint of a class b. the grouped data result is more accurate than the ungrouped result c. the grouped data computations are used only when a population is being analyzed d. None of these alternatives is correct. Answer: a

25. The measure of dispersion that is influenced most by extreme values is a. the variance b. the standard deviation c. the range d. the interquartile range Answer: c

26. When should measures of location and dispersion be computed from grouped data rather than from individual data values? a. as much as possible since computations are easier b. only when individual data values are unavailable c. whenever computer