1 The president of a company that manufactures car seats has been concerned abou

Question

1 The president of a company that manufactures car seats has been concerned about the number and cost of machine breakdowns. The problem is that the machines are old and becoming quite unreliable. However, the cost of replacing them is quite high, and President is not certain that the cost can be made up in today's slow economy. To help make a decision about replacement, he gathered data about last month's costs for repairs and the ages (in months) of the plant's 20 welding machines. These data are stored in file CarSeat.MTW. Which or the following is INCORRECT? a. The least squares line is y = 115 + 247 age b. =a = 247 means for each additional month of the plant's welding machines, the cost for repairs increases on average by 2.47 points We have insufficient evidence to conclude that the age of a machine and its monthly cost of repair are linearly related c. d, 56.6% of the variation in the cost of repair is explained by the age of a machine

Explanation / Answer

The incorrect statement is:

We have insufficient evidence to conclude that the age of a

machine and it's monthly cost of repair are linearly related.

Hence, Option (c) is the correct choice. (Ans).

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