71) Since the population is always larger than the sample, the population mean: A) is always larger than the sample mean. B) is always smaller than the sample mean. C) is always larger than or equal to or smaller than or equal to the sample mean. D) can be smaller than, or larger than, or equal to the sample mean.
72) The average score for a class of 35 students was 70. The 20 male students in the class averaged 73. What was the average score for the 15 female students in the class? A) 73 B) 70 C) 66 D) 60
73) Which of the following summary measures is affected most by outliers? A) the first quartile B) the second quartile C) the third quartile D) None of the above
74) When extreme values are present in a set of data, which pair of the following descriptive summary measures of central tendency and dispersion is most appropriate? A) mean and standard deviation B) median and interquartile range C) range and coefficient of variation D) mode and variance
75) Which measures of central tendency are not affected by extremely small or extremely large values? A) arithmetic mean and median B) arithmetic mean and mode C) arithmetic mean and geometric mean D) median and mode
76) If a distribution is highly skewed, what measure of central tendency should be avoided? A) arithmetic mean B) median C) mode D) all of the above
77) A question in a survey asks for a respondent’s favorite sport. Which measure of central tendency should be used to summarize this question? A) arithmetic mean B) geometric mean C) median D) mode
78) According to Chebyshev’s Theorem, at least what percent of the observations lie within ±1.25 standard deviations of the mean? A) 36% B) 56% C) 76% D) 96%
79) Which measure of central location is used to determine an average annual percent increase? A) arithmetic mean B) weighted mean C) geometric mean D) median
80) In the calculation of the arithmetic mean for grouped data, which value is used to represent all the values in a particular class? A) the lower limit of the class B) the upper limit of the class C) the frequency of the class D) the midpoint of the class