This is the question.

An experiment was run to investigate the amount of weight lost (in grams) by ground beef ham burgers aer grilling or frying, and how much the weight less is affected by the percentage fat in the beef before cooking. Hamburger patties weighing llg each were prepared from meat with the required fat content. Postcooking weight data (in grams} for the meat cooking experiment Frying Grilling Fat content Fat content NH: 15% Z': lll'll'o 15% 2% 31 35 TI 84 83 T8 33 30 T! 84 83 T5 35 32 T2 82 85 T8 34 30 ED 81 86 T9 34 32 ED 86 SS 82 (f) Calculate the variance associated with the contrast . How does the value of the variance compare with the variance (12 of the random error variables