17. Disinfectants An experiment was conducted to study the use of 95% ethanol versus 20% bleach as a disinfectant in removing contamination when culturing plant tissues. The experiment was repeated 15 times with each disinfectant, using cuttings of eggplant tissue.9 The observation reported was the number of uncontaminated eggplant cuttings after a 4-week storage.

a. Are you willing to assume that the underlying variances are equal?

b. Using the information from part

a, is there evidence of a significant difference in the mean numbers of uncontaminated eggplants for the two disinfectants tested?

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Disinfectant 95% Ethanol 20% Bleach n Mean Variance 3.73 2.78095 15 Pooled variance 1.47619 4.80 .17143 15