The CableCast Cable TV Company is a national chain that services the small college town where Tech, with a student population of almost 30,000, is located. The company has generally been able to handle service calls and installations in the past, but a growth trend in the town and occasional significant jumps in service requests, especially for new Internet installations, have made it more difficult for the company to determine the number of technicians and trucks it needs to maintain good service for its customers. Following is the demand for service calls during the past 36 months.

Develop a monthly forecast for the upcoming year for CableCast. What are possible reasons for the occasional increase and decreases in the monthly demand for servicecalls?

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Month anuary February March April May une July August September October November December Year 1 Service Calls 1,048 326 303 351 673 274 219 1,347 973 536 312 577 Year 2 Service Calls 1,155 319 324 344 712 306 245 1,455 1,056 545 298 481 Year 3 Service Calls 1,135 365 341 370 694 310 266 1,505 981 317 562