A bacteriologist is interested in the effects of two different culture media and two different times on the growth of a particular virus. He or she performs six replicates of a 22 design, making the runs in random order. Analyze the bacterial growth data that follow and draw appropriate conclusions. Analyze the residuals and comment on the model’s adequacy.

Culture Medium Time (h) 1 2 21 22 25 26 12 23 28 24 25 20 26 29 27 37 39 31 34 18 38 38 29 33 35 36 30 35