The manufacturer of a certain voltmeter claims that 95% or more of its readings are within 0.1% of the true value. In a sample of 500 readings, 470 were within 0.1% of the true value. Is there enough evidence to reject the claim?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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4.
(a) The manufacturer of a certain voltmeter claims that 95% or more of its readings are within
0.1% of the true value. In a sample of 500 readings, 470 were within 0.1% of the true
value. Is there enough evidence to reject the claim?
(b) A manufacturer of computer workstations is testing a new automated assembly process.
The current process has a defect rate of 5%. In a sample of 400 worksations assembled by
the new process, 15 had defects. Can it be concluded that new process has a lower defect
rate?

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