13. In a waiting line problem, increasing advertising expenditures, increasing the number of promotions, or changing the price of a service is most likely to affect A. customer arrival rates B. service rates C. the priority rule D. the line arrangement 14. In a waiting line problem, assigning additional employees to a service facility will have a direct effect on A. the line arrangement B. the average time customer waiting in line C. the size of the customer population D. the number of service phases 15. With a single-server model, increasing the service rate holding all other factors constant will A. increase the utilization of the server B. increase the time spent per customer C. decrease the probability that there are 2 or more customers in the system at any time D. decrease the arrival rate of customers Page 3