Efficient Hiring, Inc., assists companies in hiring people to fill jobs. The file called Hired contains data on a sample of the placements made by the company. The two variables in the file are the number of days required to fill the position and the costs incurred (including advertising, interviewing, etc.) to complete the hiring process.
a. Calculate the variance and standard deviation for the sample cost data.
b. Construct a box and whisker plot for the cost data. 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.