An article investigates the effects of the levels of several vitamins in a cell culture on the yield (in g/l) of pyruvate, a useful organic acid. the data consists of two replicates of a 23 design. the factors are a: nicotinic acid, b: thiamine, and c: biotin. each factor was tested at two levels. the data can be found in the textbook or on the datasets page here (ex9-5-4). compute the estimates of the main effects and interactions, and the sum