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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
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Phoniex University
Oct-2001 - Nov-2016
5.78 Refer to Exercise 5.77.
a. Estimate the median percentage of SiO2 using a 95% confidence interval.
b. Evaluate whether the median percentage of SiO2 is different from 6.2% using an a = .05 test of hypothesis.
Exercise 5.77
5.77 The recipe for producing a high-quality cement specifies that the required percentage of SiO2 is 6.2%. A quality control engineer evaluates this specification weekly by randomly selecting samples from n = 20 batches on a daily basis. On a given day, she obtained the following values:
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a. Estimate the mean percentage of SiO2 using a 95% confidence interval.
b. Evaluate whether the percentage of SiO2 is different from the value specified in the recipe using an a = .05 test of hypothesis.
c. Use the following plot to determine if the procedures you used in parts (a) and (b) were valid.

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