You are asked to design an experiment to compare the typing efciencies of three different types of keyboards denoted by A, B and 0'. Two typists, denoted by T1 and T2, will be employed and six manuscripts m1, m2, m3, m4, m5 and 7115 will be used in this experiment. a) Give your experimental plan. b) Which principles you have used when designing the experiment? Comment on their ben- ets in this experiment