Question: A manufacturing company makes brackets for bookshelves. The brackets provide critical structural support and must have a 90-degree bend 1 degree. Measurements of the bend

A manufacturing company makes brackets for bookshelves.

The brackets provide critical structural support and must have a 90-degree bend ±1 degree. Measurements of the bend of the brackets were taken at 18 different times. Five brackets were sampled at each time. The data are in the file < ANGLE >.

a. Construct control charts for the range and mean.

b. Is the process in a state of statistical control?

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