Referring to Problem 6, suppose the process remained in control for the next 40 hours. The thickness

Referring to Problem 6, suppose the process remained in
control for the next 40 hours. The thickness measurements for hours 41 through
43 are as follows:

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Referring to Problem 6, suppose the process remained in control for the next 40 hours. The thickness
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a. Based on these data and the two control charts, what
should you conclude about the process? Has the process gone out of control?
Discuss.

 b. Was it necessary to obtain your answer to Problem 15
before part a could be answered? Explain your reasoning.

Referring to the process control charts developed in Problem
5, data for periods 31 to 40 are contained in the file Grandfoods-Extra.

 a. Based on these data, what would you conclude about the
energy bar process?

 b. Write a report discussing the results, and show the
control charts along with the new data.

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