Use R programming

A company attempts to evaluate the potential for a new bonus plan by selecting a sample of 4 salespersons to use the bonus plan for a trial period. The weekly sales volume before and after implementing the bonus plan is shown below. (For the following matched samples, let the difference "d" be d = after - before.) Weekly Sales Salesperson Before After 14844 24840 33836 44450 a. State the hypotheses. b. Compute the test statistic. c. Use Alpha = .05 and test to see if the bonus plan will result in an increase in the mean weekly sales.