During the development of a new drug, pharmaceutical companies monitor the drug's active pharmaceutical ingredient (API). An article published in Organic Process Research & Development (July 2013) demonstrated the use of an individual control chart (x-chart) for this purpose. The data in the table represent API values for 53 consecutive batches of the new drug.

a. Locate the mean and standard deviation of the sample data on the printout.

b. Use the mean and standard deviation to find the center line and the upper and lower control limits for an x-chart of the data, as in Example 13.3.

c. Plot the data in an x-chart. Is the process in control?

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