You are interested in understanding whether a newly synthesized chemical, called Xepotan, can function as an antibiotic (i. e. that it can kill bacteria). You streak twenty plates of bacteria. To ten plates you place a paper disk soaked with Xepotan in the middle of the plate and to the other ten plates you place a paper disk soaked with water in the middle of the plate. Twenty-four hours later, you look at the plates and measure the zone of inhibition of bacterial growth. The bigger the zone of no growth, the more effective the antibiotic. You take the following measurements (mm): Xepotan 4.25 3.77 4.12 3.34 3.86 4.07 4.03 2.48 3.69 4.20 Water 0 0 1.01 5.00 0 0 1.05 0 0 0 To compare the zone of inhibition of bacterial growth in the two groups, we calculate the sample means. What is the mean of the zone of no growth in plates with a disk of Xepotan