Question

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
Mean	3.76	4.86
Variance	2.78091	0.17146
n	15	15
Pooled variance 1.47619

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 μ₁ for 95% ethanol disinfectant and μ₂ for 20% bleach disinfectant. Use α = 0.05.)

State the test statistic. (Round your answer to three decimal places.)

t =

Answer 1

The statistical software output for this problem is :

Test statistics = t = -2.479