The article Evaluating Tunnel Kiln Performance (Amer. Ceramic Soc. Bull., Aug. 1997: 5963) gave the following summary
Question:
The article “Evaluating Tunnel Kiln Performance” (Amer.
Ceramic Soc. Bull., Aug. 1997: 59–63) gave the following summary information for fracture strengths (MPa) of ceramic bars fired in a particular kiln:
.
a. Calculate a (two-sided) confidence interval for true average fracture strength using a confidence level of 95%.
Does it appear that true average fracture strength has been precisely estimated?
b. Suppose the investigators had believed a priori that the population standard deviation was about 4 MPa. Based on this supposition, how large a sample would have been required to estimate m to within .5 MPa with 95% confidence?
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Related Book For 
Probability And Statistics For Engineering And The Sciences
ISBN: 9781133169345
8th Edition
Authors: Jay L Devore, Roger Ellsbury
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