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Refer to the freezer problem 17 51 with 23

Refer to the freezer problem 17.51 with μ = 23 and σ = 2. Temperature measurements are recorded four times a day (at midnight, 0600, 1200, and 1800). Twenty samples of four - observations are shown below.

(a) Construct upper and lower control limits for the x chart, using the given process parameters.

(b) Plot the data on the control chart.

(c) Is this process in control? Explain your reasoning.

(a) Construct upper and lower control limits for the x chart, using the given process parameters.

(b) Plot the data on the control chart.

(c) Is this process in control? Explain your reasoning.

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