A firm that operates a large sales force would like to build a system to monitor the progress of new agents. A key task for agents is to open new accounts. To build the$$ system, the firm has monitored activities of new agents over the past two years. The response of interest is the profit to the firm$($in dollars$)$ of contracts sold by agents over their first year. Among the possible explanations of this performance is the number of new accounts developed by the agent during the first three months of work.