Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Chapter 12, Problem 2CS
What do you estimate the standard deviation
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2. An electrical firm manufactures light bulbs that have a lifetime that is approximately normally
distributed with a standard deviation of 36 hours. A lifetime test of n=36 samples resulted in
the sample average of 1510 hours. Assume the significance level of 0.05.
(a) Test the hypothesis Ho: µ = 1000 versus H1: µ# 1000 using a p-value.
(b) Test the hypothesis using critical region(s) approach.
(c) Suppose that the true mean lifetime is 1510 hours. What is type Il error probability for this|
two-sided test.
Test tube level indicator length is the quality characteristic of interest. 28 samples with sample size of 4 each, are chosen from the process. The data yields an average length of 11 cm and process standard deviation of 4 cm. What is the probability of having the length between 9 and 12 cm?
An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed
with a standard deviation of 36 hours. A lifetime test of n=36 samples resulted in the sample average of
1510 hours. Assume the significance level of 0.05.
(a) Test the hypothesis HO:µ=1500 versus H1:µ#1500using ap-value. (10pts)
(b) Calculate the power of the test if the true mean lifetime is 1510. (10pts)
Chapter 12 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 12 - Define accuracy or precision in terms of a...Ch. 12 - What does the nature of the process refer to?Ch. 12 - Suppose you have a pistol�shooting process that...Ch. 12 - Review the steps required to make a PC study of a...Ch. 12 - Why do not standard tables exist detailing the...Ch. 12 - Here are some common, everyday processes with...Ch. 12 - Why might the diameter measurements for holes...Ch. 12 - What are some common manufactured items that may...Ch. 12 - What are common reasons for sampling inspection...Ch. 12 - Fill in this table with one of the four following...
Ch. 12 - Now explain why when we sample, we cannot avoid...Ch. 12 - Which error can lead to legal action from the...Ch. 12 - Define and explain the difference between andX and...Ch. 12 - What is Cp, and why is a value of 0.80 not good?...Ch. 12 - Prob. 15RQCh. 12 - What are some of the alternatives available to you...Ch. 12 - Cpk is another process capability index. How does...Ch. 12 - In a sigma chart, are σ values for the samples...Ch. 12 - What is an assignable cause, and how is it...Ch. 12 - Why is the range used to measure variability when...Ch. 12 - How is the standard deviation of a distribution of...Ch. 12 - In the last two decades, the quality in...Ch. 12 - Figure 12.15 shows a bimodal check sheet...Ch. 12 - Control charts use upper and lower control limits....Ch. 12 - In Figure 12.10, what are the USL and the LSL,...Ch. 12 - What are four major branches (fishbones) on a...Ch. 12 - How does variation in the measuring device...Ch. 12 - What are Taguchi or factorial experiments, and how...Ch. 12 - How does the Taguchi approach differ from the...Ch. 12 - Why are Taguchi experiments so important compared...Ch. 12 - Explain what happed to improve the process inÂ...Ch. 12 - In Table 12.1, explain MOâ€�COâ€�MOO....Ch. 12 - What is a quality circle, and how might you apply...Ch. 12 - Which of the seven QC tools is being used inÂ...Ch. 12 - Go to a subway restaurant and develop a process...Ch. 12 - What do you estimate the standard deviation of...Ch. 12 - Is the dashed line in the figure labeled mean the...Ch. 12 - From the information given in the discussion and...Ch. 12 - What is the most glaring error in the figure, and...
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