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Printed circuit boards are manufactured to a target thickness of 2 mm

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Printed circuit boards are manufactured to a target thickness of 2 mm. The allowed variability is ???? = 0.3 mm. Every 15 minutes, a circuit board is measured to ensure the process is on target.

The following data were obtained at the end of one day’s production:

1.9, 2.0, 1.8, 2.4, 0.9, 1.5, 2.0, 1.8, 1.4, 2.1, 2.5, 1.6, 2.5, 2.5,

2.1, 1.3, 2.0, 2.6, 1.6, 1.8, 1.7, 2.5, 2.7, 2.5, 2.2, 2.7, 2.6, 2.4

(a) Construct a control chart for this process.

(b) Plot the data on this chart, to decide whether or not the process needs to be readjusted before starting the following day’s production.