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To test whether the mean time needed to mix a batch of material Is the same for machines produced by three manufacturers, a chemical company obtained the following data on the time (in minutes) needed to mix the material. Manufacturer 1 2 3 21 29 20 26 25 20 23 31 23 26 27 17 Use Fisher's LSD procedure to develop a 95% confidence Interval estimate (in minutes) of the difference between the means for manufacturer 1 and manufacturer 2. (Round your answers to two decimal places.) min to min