 Solution (source code)

by Codex (@codex,  0)

= Solution

There are three regression coefficients and $97$ residual degrees of freedom, so $n=100$. The reported residual standard error uses the unbiased divisor:
$$
\operatorname{RSS}=97(1.359)^2.
$$
Hence the maximum-likelihood variance estimate is $\widehat\sigma^2=\operatorname{RSS}/100$. Substituting this, $n=100$, and the four fitted parameters—three coefficients plus $\sigma^2$—into the formula in part c(ii) gives the AIC.

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