I need some help solving part (b) for this problem, thanks

5 Your answer is partially correct. Two catalysts may be used in a batch chemical process. Twelve batches were prepared using catalyst 1, resulting in an average yield of 86 and a sample standard deviation of 3. Fifteen batches were prepared using catalyst 2, and they resulted in an average yield of 91 with a standard deviation of 2. Assume that yield measurements are approximately normally distributed with the same standard deviation. {a} Is there evidence to support the claim that catalyst 2 produces higher mean yield than catalyst 1? Use a = 0.01. yes. v (b) Find a 99% condence interval on the difference in mean yields that can be used to test the claim in part {a}. Round your answer to two decimal places leg. 98.76). n n