14.If a data set has an even number of observations, the median a.cannot be determinedb.is the average value of the two middle itemsc.must be equal to the meand.is the average value of the two middle items when all items are arranged in ascending orderAnswer: d 15.Which of the following is a measure of dispersion? c 16.The most frequently occurring value of a data set is called the b 17.The interquartile range is d 18.If index i(which is used to determine the location of the pth percentile) is not an integer, its value should be a.squaredb. divided by (n – 1) c. rounded down
4Chapter Threed.rounded upAnswer: d 19.When the data are skewed to the right, the measure of Skewness will be c 20.When data are positively skewed, the mean will usually be a 21.Which of the following is nota measure of dispersion? 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 zerob.the range is difficult to computec.the range is influenced too much by extreme valuesd.the range is negativeAnswer: 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? a24. In computing descriptive statistics from grouped data, a
Descriptive Statistics: Numerical Methods 5
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