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The concentration of active ingredient in a liquid laundry detergent is thought to be affected by the type of catalyst used in the process. The standard deviation of active concentration is known to be 3 grams per liter, regardless of the catalyst type. Ten observations on concentration are taken with each catalyst, and the data follow: Catalyst 1: 5?.6, 66.4, 65.4, 65.4, 65.2, 62.6, 6?.6, 61?, 6?.2, 71.0 Catalyst 2: 68.2, 71.5, ?0.3, 69.3, 64.8, 69.6, 68.6, 69.4, 65.3, 68.8 (a) Find a 95% twosided condence interval on the difference in mean active concentrations for the two catalysts. \\:| 5 H 1 #2 5 \\:l Round your answer to two decimal places (eo- 98.76). (b) Is there any evidence to indicate that the mean active concentrations depend on the choice of catalyst