(e) When this change is made, which parts of the expression oil*ring should be regarded as fixed-effect...
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(e) When this change is made, which parts of the expression ‘oil*ring’ should be regarded as fixed-effect terms, and which as random-effect terms?
(f) Fit this new model to the data by mixed modelling. Does the new model indicate that the linear trend from Ring 1 to Ring 4 varies significantly depending on the oil type?
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