A data set obtained to study the protective effect of helmets used in a contact

Question

A data set obtained to study the protective effect of helmets used in a contact sport includes the following variables.

Severity was measured 10 separate times for each combination of helmet model and side of impact. The severity of impact was modeled as a function of the two categorical variables, model and side.

1. Compare the residual plots for the two models, and explain which ones are better and why.

Model one of 4 helmet models (brands): A, B, C, or D Side: helmet side of impact: Front or Back a continuous measure of severity of impact transmitted through the helmet severity:

Explanation / Answer

The residuals for model 2 are looking more convincing

The residuals are equally distributed on both sides of the fitted line.

More equal the distribution on both sides of the curve,more better is the model.

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