Recent crime reports on the number of aggravated assaults at each of the 18 largest universities reporting for the year are summarized in the computer output.

(a) Locate a measure of variation and also calculate the sample variance.
(b) Calculate the interquartile range and interpret this value.
(c) Give a value for a standard deviation that would correspond to greater variation in the numbers of aggravated assaults.

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Variable N Mean StDev AggAsult 18 5.44 4.89 Minimum Q1 Median Q3 Maximum 0.00 2.00 4.00 8.2517.00