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Author Question: A glass company produces panes of glass that have specifications for a thickness of 0.3 inches. The ... (Read 162 times)

audragclark

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on: Jun 24, 2018
A glass company produces panes of glass that have specifications for a thickness of 0.3 inches. The process standard deviation is known to be 0.04 inches. A random sample of 45 panes of glass has an average thickness of 0.322 inches. What is the 90 confidence interval around the mean? What can we say about this process?

Question 2

A random sample of thirty daily water productions (expressed in thousands) for a given city yielded a mean of 2489.067 and standard deviation of 74.67 . What are the point estimates for the true mean daily water production and the point estimate for the variance of this population? Mean = ___________________ _ Variance = ___________________ _
 Fill in the blank(s) with correct word


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rosiehomeworddo

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Reply #1 on: Jun 24, 2018
Answer to Question 1

0.312 inches, 0.332 inches. Since this interval does not include the 0.30 inches in the specifications, the process is not performing satisfactorily.

Answer to Question 2

2489.067; 5575.61


audragclark

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Reply 2 on: Jun 24, 2018
Excellent

xiazhe

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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