Analyze the data in Problem 12-9, assuming that operators are fixed, using both the unrestricted and the restricted form of the mixed models. Compare the results obtained from the two models.

Problem 12-9

An experiment was performed to investigate the capability of a measurement system. Ten parts were randomly selected, and two randomly selected operators measured each part three times. The tests were made in random order, and the data below resulted.

 

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Operator 1 Measurements Operator 2 Measurements Part Number 1 3 1 3 50 49 50 50 48 51 1 2 52 52 51 51 51 51 53 50 50 54 52 51 3 49 51 50 48 50 51 4 48 49 48 48 49 48 52 50 50 52 50 50 7 51 51 51 51 50 50 8 52 50 49 53 48 50 9 50 51 50 51 48 49 47 46 49 46 47 48 10