The president of a company that marufactures car seats has been concerned about

Question

The president of a company that marufactures 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? 1 The least squares line is y = 115 + 247 age b.-b-247 means for each additional month of the plant's welding machines, the cost for repairs increases on average by 2.47 points. c. We have insufficient evidence to conclude that the age of a machine and its monthly cost of repair are linearly related d. 56.6% of the variation in the cost of repair is explained by the age of a machine. In 2003, Brand A microwaves had 45% of the market, Brand B had 35%, and Brand C had 20%. This year the makers of brand C launched a heavy advertising campaign. A random sample of appliance stores shows that of 10,000 microwaves sold, 4350 were Brand A, 3450 were Brand B, and 2200 were Brand C. Has the market changed? Test at =0.01. Which of the following is INCORRECT? 2 a. H. : Pl =0.45, p.-0.35, p.-0.20 b. Test statistic: 2=25.714 c. No, the market hasn't changed since 2003. d. Yes, the market has changed since 2003. Ina one-way ANOVA, if the computed F statistic exceeds the critical F, then a. reject H, since there is evidence all the means differ b. reject H, since there is evidence of at least two means differ c. do not reject H, since there is no evidence of a difference d. do not reject H, because a mústake has been made 3.

Explanation / Answer

Question 1: Option (d) is incorrect.

Question 2: Option (b) is incorrect.

Question 3: Option (c) is incorrect.

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