A plant manager wants to see if there are different proportions of defective items among the four machines at her automotive plant. She randomly selects 100 automobile parts from each of the four machines, as shown in the table below: Machine A B C D Number of Defective Parts 58 55 51 66 Is there appropriate evidence the machines are not equal concerning proportions of defective products?

A plant manager wants to see if there are different proportions of defective items among the four machines at her automotive plant. She randomly selects 100 automobile parts from each of the four machines, as shown in the table below: Machine A B C D Number of Defective Parts 58 55 51 66 Is there appropriate evidence the machines are not equal concerning proportions of defective products?

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

Evidence of Inequality:

A plant manager wants to see if there are different proportions of defective items among the four machines at her
automotive plant.
She randomly selects 100 automobile parts from each of the four machines, as shown in the table below:
Machine
A B
C
D
Number of Defective Parts
58
55
51
66
Is there appropriate evidence the machines are not equal concerning proportions of defective products?

A
Yes, at the 1%, 5%, and 10% alpha levels.
B
Yes, at the 5% and 10% alpha levels, but not at the 1% level.
C
Yes, at the 10% alpha level, but not the 1% or 5% levels.
D
No, not at any of the common alpha levels of 1%, 5%, or 10%.
No, in fact there is strong evidence the machines are all equally accurate concerning proportions of
E
defective products.

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