A chemical reaction experiment was carried out with the objective of com- paring if a new catalyst B would give higher yields than the old catalyst A. The experiment was run on six different batches of raw material which were known to be quite different from one another. Each batch was divided into two portions to which A or B was applied at random. The data collected are given in Table 3.43. (a) Explain the experimental design. {b} Carry out the appropriate I test. (c) Construct a 95% condence interval for the difference between catalysts A and B