Question 6

To assess whether the linear model is reliable, you need to check for three things: 1. linearity 2. nearly normal residuals 3. constant variability.

You already checked if the relationship between runs and at-bats is linear using a scatterplot. You should also verify this condition with a plot of the residuals vs. at-bats. The lty=3 argument adds a horizontal dashed line at y = 0: plot(m1$residuals ~ mlb11$at_bats) abline(h = 0, lty = 3).

Which of the following statements about the residual plot is false?

Possible Answers

The residuals appear to be randomly distributed around 0.
The residuals show a curved pattern.
The plot is indicative of a linear relationship between runs and at-bats.
The team with a very high residual compared to the others appears to be an outlier.

Exercise

Question 6

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