QUESTION: 65

= 0.05 In problem 1, do the data indicate that the population for machine A has a larger standard deviation?

yes
no

Answer(s): B

= 0.05 The average weight of castings produced at the Nebraska foundry is 3.7 lbs. A new supplier from Kansas has submitted a batch of castings known to have normally distributed weights. A random sample of 10 has an average weight of 3.6 lbs. and standard deviation 0.06 lbs. Do these data indicate that the Kansas foundry produce lighter castings on average?

yes
no

Answer(s): A

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QUESTION: 67

= 0.05 A machine tool vender wants to sell an injection molding machine. The current machine produces 3.2% defectives. A sample of 1100 from the vender’s machine has 2.9% defective. Do these numbers indicate that the proposed machine has a lower rate of defectives?

yes
no

Answer(s): A

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QUESTION: 68

An engineer wants to try two hardening ovens to see whether they have different hardness scores. She cuts 8 pieces of bar stock in half, putting half of each in oven A and the other half in oven B. The following data are collected: Do the data indicate that the ovens have different average scores? Assume differences are normally distributed.

yes
no

Answer(s): B

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QUESTION: 65

QUESTION: 66

QUESTION: 67

QUESTION: 68

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