An experiment was conducted to study the use of 95% ethanol versus 20% bleach as a disinfectant in removing contaminatio

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An Experiment Was Conducted To Study The Use Of 95 Ethanol Versus 20 Bleach As A Disinfectant In Removing Contaminatio 1 (117.64 KiB) Viewed 65 times

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. The observation reported was the number of uncontaminated eggplant cuttings after a 4-week storage. Disinfectant 95% Ethanol 20% Bleach 3.74 Mean Variance 4.80 0.17146 2.78093 n 15 15 Pooled variance 1.47620 in USE SALT (a) Are you willing to assume that the underlying variances are equal? Yes, the ratio of the larger variance to the smaller variance is less than three. O Yes, the ratio of the larger variance to the smaller variance is more than three. O No, the ratio of the larger variance to the smaller variance is less than three. O No, the ratio of the larger variance to the smaller variance is more than three. It is not possible to check that assumption with the given information. (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? (Use #1 for 95% ethanol disinfectant and Hz for 20% bleach disinfectant. Use a = 0.05.) State the null and alternative hypotheses. O Ho: (41 - 42) = 0 versus Ha: (H1 - H2) > 0 O Ho: (41 - M) < 0 versus Ha: (41-42) > 0 OHO: (M1 - H2) # O versus Ha: (#1 - H2) = 0 O HO: (41 - H2) = 0 versus H: (41 - 2) = 0 OHO: (H1 - H2) = 0 versus Ha: (u 1 - H2) < 0 State the test statistic. (Round your answer to three decimal places.) t = State the p-value.
O Ho: (41 - H2) = 0 versus H: (M1 - H2) < 0 State the test statistic. (Round your answer to three decimal places.) t = State the p-value. O p-value < 0.010 O 0.010 < p-value < 0.020 O 0.020 < p-value < 0.050 O 0.050 <p-value < 0.100 O 0.100 < p-value < 0.200 O p-value > 0.200 State the conclusion. OH, is rejected. There is insufficient evidence to conclude that there is a significant difference in the mean numbers of uncontaminated eggplants for the two disinfectants used. O Ho is rejected. There is sufficient evidence to conclude that there is a significant difference in the mean numbers of uncontaminated eggplants for the two disinfectants used. O Ho is not rejected. There is sufficient evidence to conclude that there is a significant difference in the mean numbers of uncontaminate eggplants for the two disinfectants used. O He is not reje There is insufficient evidence to conclude that there is a significant difference in the mean numbers of uncontaminated eggplants for the two disinfectants used. You may need to use the appropriate appendix table to answer this question.