Question: Control chart for x-bar and s are maintained on a process. After 25 preliminary subgroups each of size 3 are evaluated, you have the following

Control chart for x-bar and s are maintained on a process. After 25 preliminary subgroups each of size 3 are evaluated, you have the following data:

Assume that the quality characteristic is normally distributed.

Compute control limits for the x-bar and s control charts.(6 marks)

Assume that the process exhibits statistical control. Estimate the process mean and standard deviation.

Suppose that the quality characteristic is normally distributed with specifications at 2.25 4. Estimate the fraction nonconforming produced by this process.

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