with a levels of factor A and b levels of B. If the expeiment is replicated n times, the data layout will look like Table l3.2.In general, the observation in the ijth cell in the kth replicate is y,-jk. In collecting the data, the
abn observations would be run in random order. Thus, like the single-factor experiment studied in Chapter 4, the two~factor factorial is a completely randomized design. Both factors
are assumed to be fixed effects.