The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed and o = 3. The past five days of plant operation have resulted in the following yields 91.6, 88.75, 90.8, 89.57, and 91.0. Find a 95% two-sided confidence interval on the true mean yield. (a) Calculate the sample mean. Round your answer to 2 decimal places. x= i (b) Calculate the 95% two-sided confidence interval on the true mean yield. Round your answers to 1 decimal place. <μ< i

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Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.