The following data show the effect of 4 operators, chosen randomly, on the output of a particular machine.
Operator
1
2
3
4
175.4
168.5
170.1
175.2
171.7
162.7
173.4
175.7
173.0
165.0
180.1
170.5
164.1
170.7
183.7
(a) Perform a random effects analysis of variance at the 0.05 level of significance.
(b) Compute an estimate of the operator variance component and the experimental error variance component.
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