Three different washing solutions are being compared to study their effectiveness in retarding bacteria growth in five-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 a = 0.05) and draw conclusions

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