3, In order to evaluate the performance of new machinery in food industry, output of 20 batches work studied form the new machinery as well as the existing machinery. The summary results (in metric Ions ) were as follows New machinery Existing machinery D = 57 J = 48 s =5 S= 6 n = 20 71 = 20 Suppose an increase of more than 6.5 metric tons per batch is required for the use of new machinery to be profitable. Perform appropriate test and make your recommendation. [Use a = 0.05]