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

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 Î± = .05 test of hypotheses.
c. Produce a plot to determine if the procedures you used in parts (a) and (b) were valid.

L70 9.86 544 428 4.59 8.76 9.16 628 3.83 3.17 5.98 2.77 359 3.17 8.46 7.76 5.55 5. 956 358

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