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33. If a data set has an even number of observations, the median a. cannot be determined b. is the average value of the two middle items C. must be equal to the mean d. is the average value of the two middle items when all items are arranged in ascending order 34. When data are positively skewed, the mean will usually be a. greater than the median b. smaller than the median C. equal to the median d. positive 35. Which of the following is not a measure of dispersion? a. the range b. the 50th percentile C. the standard deviation d. the interquartile range 36. 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 packages for descriptive statistics are unavailable d. only when the data are from a population