Plot the average bacteria counts for each solution in Problem 4-2 and compare them to a scaled t distribution. What conclusions can you draw?

Problem 4-2

Three different washing solutions are being compared to study their effectiveness in retarding bacteria growth in 5-gallon milk containers. The analysis is done in a laboratory, and only three trials can be run on any day. Because days could represent a potential source of variability, the experimenter decides to use a randomized block design. Observations are taken for four days, and the data are shown here. Analyze the data from this experiment (use α = 0.05) and draw conclusions.

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Days Solution 1 2 3 4 1 13 22 18 39 16 24 17 44 5 4 1 22 23