The CFU.txt file contains data on the average number of colony-forming units (CFU) measured by 11 student subjects in 5 different antibacterial treatments. This is the link to access CFU.txt: https://drive.google.com/file/d/1Z73nH1J3Ku2-a9n6oOwJGUXObUnsv1hE/view?usp=share_link a) Check if there is a difference in the mean number of CFU according to the antibiotic treatment. 1. Test the homogeneity of the variances between the five treatments using Levene's test. Use the leveneTest() function on Rstudio. Interpret the result. The test must be computed at length but can be corroborated by anova() in Rstudio.

b) According to the results, identify the groups that are different from the others.