An experiment studied the efcacy of using 95% ethanol or 20% bleach as a disinfectant in removing bacterial and fungal contamination when culturing plant tissues. The experiment was repeated 15 times with each disinfectant, using eggplant as the plant tissue being cultured. Five cuttings per plant were placed on a petri dish for each disinfectant and stored at 25C for 4 weeks. The observation reported was the number of uncontaminated eggplant cuttings after the 4-week storage. Disinfectant 95% Ethanol 20% Bleach Mean 3.?5 4.83 Variance 2.78095 0.1?143 n 15 15 Pooled variance 1.47619 (a) Are you willing to assume that the underlying variances are equal? 0 Yes Q No J (b) Using :he information from part (a), are you willing to conclude that there is a signicant difference in the mean numbers of uncontaminated eggplants for the two disinfectants tested? (Use p1 for 95% ethanol disinfectant and #2 for 20% bleach disinfectant. Use a = 0.05.) State the null and alternative hypotheses. O I\"'0: (#1 #2) f 0 VETSUS Ha: (#1 #2) = 0 O I\"'0: (#1 #2) = 0 VETSUS Ha: (#1 #2} > '3 O I\"'0: (#1 #2) '3 O I\"'0: (#1 #2) = 0 VETSUS Ha: (#1 #2}