Question: =+c. Fitting the model with all 4 predictors as well as all second-order interactions gave R2 5 .960 (this model was also fit by the

=+c. Fitting the model with all 4 predictors as well as all second-order interactions gave R2 5 .960

(this model was also fit by the investigators).

Does it appear that at least one of the interaction predictors provides useful information about power over and above what is provided

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