Instructions appear on the first tab of the Excel file. The two worksheets that follow enable instructors to demonstrate how changes in the magnitude of the treatment effects and of the standard deviation of the error term will impact significance in a One-Way ANOVA model. The user specifies three input values that influence the simulation of random observations. ANOVA calculations are provided for the student, leaving the focus on the interpretation of the results. The mirror site contains an article that can serve as a teaching note to accompany the worksheets.