A residual plot and normal quantile plot from the linear regression of Y on X based on the bullfrog mass data in Exercise 12.S.8 follow.
Use these plots to comment on the required conditions for inference in regression. Is there any reason to substantially doubt that these conditions are met?

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0.15- 0.05 0.05 -Q15 -L ㄒㄧㄧㄧㄧㄒㄧㄧㄧㄒㄧ一 ㄧㄧㄧ . 11 12 1314 Predicted 0.15 0.05 -0.05 -0.15セ 00.5 10 Normal scores