In an interaction analysis, the probability of a false-positive result increases as the correlation between our covariate and predictor increases, and as the effect of our covariate x predictor interaction increases. The extremely simple solution is to include all covariate-by-predictor interactions in your model!
Here is my analysis of 'what correlates with how well someone climbs?'.
Elizabeth Urey Baranger (born Gertrude Elizabeth Urey) (09/18/1927 - 05/30/2019) was an American theoretical physicist and senior administrator at the University of Pittsburgh.