第二章测试1.The measure of dispersion most commonly used in conjunction with the arithmetic mean is the: （ ）
A:interquartile range B:range C:variance D:standard deviation
答案:D
2.Simply by scanning the values in each distribution below, identify the distribution with the smallest standard deviation.（ ）
A:6, 6, 9, 10, 11, 12, 14, 17, 20, 90 B:80, 80, 80, 80, 80, 80, 80, 80, 80, 80 C:7, 8, 9, 10, 11, 12, 13, 14, 15, 16 D:9, 9, 9, 10, 10, 10, 10, 11, 11, 11 3.The most commonly used measure of central location for antibody titers is the:（ ）
A:arithmetic mean B:mode C:geometric mean D:median 4.Which range characterizes the interquartile range?（ ）
A:From 1.96 standard deviations below the mean to 1.96 standard deviations above the mean B:From 25th percentile to 75th percentile C:From 5th percentile to 95th percentile D:From 10th percentile to 90th percentile 5.All of the following are measures of dispersion EXCEPT: （ ）
A:standard deviation B:median C:interquartile range D:range
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