Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed and o = past five days of plant operation have resulted in the following yields 91.6, 88.75, 90.8, 89.85, and 91.6. Find a 95% two-sided confidence interval on the true mean yield. (a) Calculate the sample mean. Round your answer to 2 decimal places. 文= 90.52 (b) Calculate the 95% two-sided confidence interval on the true mean yield. Round your answers to 1 decimal place.

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