In paper manufacturing, pulp brightness is an important performance characteristic. Customers require maximum pulp brightness with maximum uniformity (minimum variance). The company is testing two bleaching chemicals for effectiveness in achieving a brightness of 90. Assume that the data are normally distributed. (a) State and test the hypothesis that the brightness variances of the two chemicals are equal at = 0.05. (b) State and test the hypothesis that the brightness means for the two chemicals are equal at = 0.05. (c) Which chemical best fulfills the requirements of maximum brightness at minimum variance? using minitab