The residual plot below came from data which plotted grade at midterm against gr

Question

The residual plot below came from data which plotted grade at midterm against grade on final exam. A linear regression line was calculated. Which conclusion could be reached by analyzing the residual plot? An exponential curve could be used to predict final grade given midterm grade. Students did better on the final exam then they did on the midterm. There is evidence that a linear model is appropriate. There exists unequal variance throughout the model. There is no pattern evident in the residual plot.

Explanation / Answer

The conclusion should be there exists unequal variancethroughout the model. So, D is the correct one.

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