Question: Problem 6.1

A research team studies the influence of body weight and heart weight on the kidney weigh of rats. Ten rats were selected over a range of body weights, and the following results were recorded. The data are given in the attached file called kidney

Consider the models:

y = b₀ + b₁x₁ +e.

y = b₀ +b₂x₂ +e.

y = b₀ + b₁x₁ + b₂x₂ +e.

which of these models are appropriate? Why?

Determine if there are any unusual data points. If there are, does their removal have an effect on the fitting results for the models in (a)? If there are cases with large effects, how would you present the results to the research team?