Refer to Exercise $10\mathrm{.}40.$ Suppose the recruitment director is preparing a presentation for upper management to recommend new hiring practices of the firm.

a$.$ Provide a graph of the data in Exercise $10\mathrm{.}40.$

b$.$ Comment on the results from Exercise $10\mathrm{.}40$ in terms of do whether hiring practices over the past $1-2$ years appear to be successful. If not, suggest some changes.