QUESTION $4$

$[18]$

A decision was to be made as to whether to purchase computer A or B$.$ The decision was to be based on the CPU time a computer took to run a benchmark program. Six different benchmark programs were chosen, all run on both computers A and B in a random order, and the CPU times recorded. The layout of the design of the experiment is shown in the table below.

$\backslash$table$[[,$Benchmark Program$],[$Computer$,1,2,3,4,5,6],[A,y_{A1},y_{A2},y_{A3},y_{A4},y_{A5},y_{A6}$