Please help with ONLY PARTS C AND D.

They're just asking what the hypothesis test was, and whether or not it was the correct choice to do so.

The 2nd image is the answer to parts a & b for reference

\f4. Based on question in \"An Introduction to Statistical Modelling" by A.J. Dobson, 1st edition, 1983, Chapman and Hall. The weights (kg) of 10 people before and after going on a high carbohydrate diet for 3 months are shown in the following table. You want to test if, overall, there was any signicant change in weight. Person 12345678910 Weight(inkg)beforediet 64 71 64 69 76 53 52 72 79 68 Weight (in kg) after diet 61 72 63 67 72 49 54 72 74 66 Mary runs the following analysis in R: weights anova( lmfitZ, lmfitl ) Analysis of Variance Table Model 1: weights ~ l Model 2: weights ~ xvecl + xvec2 Res.Df RSS Df Sum of Sq F Pr(>F} 1 19 1355.8 2 18 1339.6 l 16.2 0.2177 0.6464 (a) Write down the model corresponding to \"1mtl\" in the matrix form of the linear model (i.e., clearly write down the matrix form and specify what all the components are for \"lmfttl\