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

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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 30 35 35 36