Question

three runners competed in a race. data were collected at each mile mark for each runner. if the runner ran at a constant pace, the data would be linear. a regression line was fitted to their data. use the residual plots to decide which data set is best fit by the regression line, and then identify the runner that kept the most consistent pace.
a. runner a
b. runner b
c. runner c

Explanation:

A residual plot with randomly scattered points close to the x-axis indicates the regression line is a good fit, meaning the original data is linear (consistent pace). Runner A's residuals are randomly distributed near the x-axis with no pattern, while Runners B and C have clustered/residual patterns showing non-linear data.

Answer:

A. Runner A