A manufacturing company uses two different machines, A and B, each of which produces a certain item part. The number of defective parts prod

Question

A manufacturing company uses two different machines, A and B, each of which produces a certain item part. The number of defective parts produced by each machine is about 1 percent. Suppose two independent random samples, each of size 100, are selected, where one is a sample of parts produced by machine A and the other is a sample of parts produced by machine B. Which of the following is true about the sampling distribution of the difference in the sample proportions of defective parts?
A The mean is 0 and the distribution is approximately normal
B The mean is 0 and the distribution will not be approximately normal
C The mean is 0.01 and the distribution is approximately normal
D The mean is 0.01 and the distribution will not be approximately normal.
Ε The mean is 1 and the distribution is approximately normal.

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RobertKer 5 years 2021-07-20T01:11:24+00:00 2 Answers 38 views 0

Answers ( )

  1. thugiang
    0
    2021-07-20T01:13:11+00:00
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    Answer:A-The mean is 0 and the distribution is approximately normal.

    Step-by-step explanation:

  2. lethu
    0
    2021-07-20T01:13:14+00:00
    Reply

    Answer:

    B: The mean is 0 and the distribution will not be approximately normal

    Step-by-step explanation:

    It is true that the mean is 0 because it is the difference in the population proportions, 0.01−0.01. However, normality cannot be assumed because the sample sizes are not large enough.

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