A pharmaceutical company is interested in the relative effects of five different drugs on a breed of cattle. A collection of thirty similar animals was randomly divided and assigned so that each drug was injected into six animals. After an appropriate period of time, two similar blood samples were taken from each animal. The readings of both blood samples were recorded for each animal. This is a completely randomized design with subsampling, having t = 5 treatments (drugs), n = 6 replications (animals) per treatment, and two s = 2 subsamples (blood samples) measured on each experimental unit