6.8. 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.

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