The following data were obtained from pour plates used to test the effectiveness of a food preservative. Two samples of cottage cheese were inoculated with bacteria; the preservative was added to one sample. After incubation, samples of the cottage cheese (control) and samples treated with the preservative (experimental) were diluted and plated on nutrient agar. Calculate the number of bacteria. Was the preservative effective?   Dilution Amount Plated (mL) Number of Colonies CFU/mL Control 1:400 1 160   Experimental 1:200 0.1 32

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