A company produces batches of 2750 axle shafts. These are tested to determine the proportion of those that have an excessively rough surface according to industry standards. a) The quality control department takes a sample of 195 axle shafts in a lot and concludes that there are between 12.70% and 23.19% of the axle shafts in that lot that are out of specification. Calculate the confidence level associated with this estimate.

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A company produces batches of 2750 axle shafts. These are tested to determine the proportion
of those that have an excessively rough surface according to industry standards.
a) The quality control department takes a sample of 195 axle shafts in a lot and concludes that
there are between 12.70% and 23.19% of the axle shafts in that lot that are out of
specification. Calculate the confidence level associated with this estimate.
Answer:
(1— а) -
b) The company would like to estimate the proportion of axle shafts, within 4.0%, that are out
of specification, 19 times out of 20. How many more axle shafts will it need to examine? You
must take into account the results obtained in (a).
Answer:
Transcribed Image Text:A company produces batches of 2750 axle shafts. These are tested to determine the proportion of those that have an excessively rough surface according to industry standards. a) The quality control department takes a sample of 195 axle shafts in a lot and concludes that there are between 12.70% and 23.19% of the axle shafts in that lot that are out of specification. Calculate the confidence level associated with this estimate. Answer: (1— а) - b) The company would like to estimate the proportion of axle shafts, within 4.0%, that are out of specification, 19 times out of 20. How many more axle shafts will it need to examine? You must take into account the results obtained in (a). Answer:
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