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n) compute both a 95% confidence interval for the mean, e(y |x), and a 95% predic-
tion interval for y|x, where x denotes the vector of median (“typical”) covariate
values. report your code and output.
) which interval do you think an oncologist may use to diagnose a particular cancer
patient with typical symptoms?
) which interval do you think a cancer researcher may use to infer about the rela-
tionship of lpsa to symptoms of typical patients?