Question: QUESTION 2 Mark: 6+6+3 = 15 The checking-in time at a hotel is to be investigated. The means of 10 samples of 15 observations each

QUESTION 2 Mark: 6+6+3 = 15 The checking-in time

QUESTION 2 Mark: 6+6+3 = 15 The checking-in time at a hotel is to be investigated. The means of 10 samples of 15 observations each given in minute in the table below: i. Construct a mean control chart for this process of checking-in with three-sigma (z=3) limits, if the process has had a standard deviation of 0.156. Plot the sample means into control chart. Is the process in control? ii. Construct a mean control chart for this process of checking-in with three-sigma (z=3) limits, if the standard deviation of the process is unavailable. Plot the sample means into control chart. Is the process in control? iii. Construct the range chart for the data provided and show the means in the range chart

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