5. Catalyst experiment H. Smith, in the 1969 volume of Journal of Quality Technology, described an experiment that investigated the effect of four reagents and three catalysts on the production rate in a catalyst plant. He coded the reagents as A, B, C, and D, and the catalysts as X, Y , and Z, giving twelve treatment combinations, coded as AX, AY,..., D Z. Two observations were taken on each treatment combination, and these are shown in Table 5.18, together with the order in which the observations were collected. Are the assumptions on the one-way analysis of variance model (3.3.1) approximately satisfied for these data? If not, can you suggest what needs to be done in order to be able to analyze the experiment?