(i) Calculate the limits for the control charts you would use to assess the operation.

(25 marks)

(ii) Plot the range chart and the average chart.

(30 marks)

(iii) Find the relative precision index and calculate modified limits for the samples averages if warranted. If modified limits are not warranted, state why.

(10 marks)

(iv) Determine whether the process is in, or out, of control and whether or not scrap is being produced. For the purpose of this question, any loads outside the upper or lower tolerances may be considered to be scrap.

(20 marks)

(v) Advise the manager what action, if any, should be taken to improve the situation

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