Question

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 5 20 batches on a daily basis. On a given day, she obtained the following values:
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 α = .05 test of hypotheses.
c. Produce a plot to determine if the procedures you used in parts (a) and (b) were valid.


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  • CreatedNovember 21, 2015
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