15.59 Paper Brightness The coded values for a measure of brightness in paper (light reflectivity), prepared by two different processes, are given in the table for samples of nine observations drawn randomly from each of the two processes. Do the data present sufficient evidence to indicate a difference in the brightness measurements for the two processes? Use both a parametric and a nonparametric test and compare your results.

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Process Brightness AB 6.1 9.2 8.7 8.9 7.6 7.1 9.5 8.3 9.0 9.1 8.2 8.6 6.9 7.5 7.9 8.3 7.8 8.9