relevant range Ralph is studying a partieular warranty eost aecount, in whieh all repair eosts for a partieular (rather expensive) industrial monitoring produet are aecumulated.

As a first step, Ralph eolleets the following data eoneerning number of warranty elaims (XJ and eost (eostJ.

t x, eost, 1 554 968,000 2 639 1,730,000 3 598 1,403,000 4 385 303,000 5 466 587,000 6 371 267,000 7 633 1,722,000 8 467 592,000 9 667 2,009,000 10 341 210,000 11 443 513,000 12 480 678,000 Carefully analyze Ralph's data.

AppendixLO1