When PricewaterhouseCoopers Saratoga released its Human Capital Index Report, it indicated that the average hiring cost for an American company to fill a job vacancy was $3,270. Sample data for recent job hires is in a file titled Hired.
a. Calculate the variance and standard deviation for the sample data.
b. Construct a box and whisker plot. Does this plot indicate that extreme values (outliers) may be inflating the measures of spread calculated in part a?
c. Suggest and calculate a measure of spread that is not affected by outliers.