The sales manager at a certain company is trying to decide how much of the budget to allocate for sales personnel for the upcoming year. Typically,…

The sales manager at a certain company is trying to decide how much of the budget to allocate for
sales personnel for the upcoming year. Typically, sales costs run about 15% of Sales. To help develop an
estimate, the sales manager studies sales (in millions $) during the past 2 years at company X, which are
given in the table below.
Month Sales
January 390
February 205
March 270
April 245
May 320
June 290
July 299
August 345
September 326
October 355
November 359
December 371
January 368
February 358
March 345
April 380
May 391
June 403
July 410
August 430
September 410
October 415
November 310
December 450
a) Use SPSS to display histogram for sales. Use class widths of 25 and begin with 225. The class
endpoints should be 225, 250, 275, …, 450.
b) show a time plot for this data. The horizontal axis should indicate the month.

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