Question: Use the following information about sales and costs to prepare a scatter diagram. Draw a cost line that reflects the behavior displayed by this cost. Determine whether the cost is variable, step-wise, fixed, mixed, or curvilinear.
Period Sales Costs
1 . . . . . . . . . . . . . $760 $590
2 . . . . . . . . . . . . . 800 560
3 . . . . . . . . . . . . . 200 230
4 . . . . . . . . . . . . . 400 400
5 . . . . . . . . . . . . . 480 390
6 . . . . . . . . . . . . . 620 550
7 . . . . . . . . . . . . . 680 590
8 . . . . . . . . . . . . . 540 430
9 . . . . . . . . . . . . . $580 $390
10 . . . . . . . . . . . . . 320 240
11 . . . . . . . . . . . . . 240 230
12 . . . . . . . . . . . . . 720 550
13 . . . . . . . . . . . . . 280 260
14 . . . . . . . . . . . . . 440 410
15 . . . . . . . . . . . . . 380 260