1. 2-Factor ANOVA Impact on Lacrosse Helmets S.V. Caswell, R.G. Deivert (2002). “Lacrosse Helmet Designs and the Effects of Impact Forces”, Journal of Athletic Training, 37(2):164-171.

2. Data Description Response: Gadd Severity Index (Higher scores = more severe) Factor A: Model (a=4 Levels) –Sports Helmets Cascade (i=1) –Sports Helmets Cascade Air Fit (i=2) –Sports Helmets Ultralte (i=3) –Bacharach Ultralte (i=4) Factor B: Side (b=2 Levels) –Front (j=1) –Back (j=2) Replicates: n=10 per Treatment Model:

3. Data - Mean (SD)

4. Data - Factor Level (Interaction) Plot

5. ANOVA

6. Post Hoc Comparisons (Model w/in Side) MSE=25374, df=72 n=10, 4 Brands, 6 Pairs/Side Front 3 2 1 4 Back 1 2 3 4