Based on the following information, provide the appropriate answer. Assume alpha = 0.05. The yield of a chemical process is being studied. From previous experience with this process the standard deviation of yield is known to be 4%. The past 5 days of plant operation have resulted in the following yields: 92.1, 87.8, 91.3, 89.6, and 93.3%. a) Create a two-sided confidence interval for the true mean yield. b) Is there sufficient evidence to conclude the mean yield is not 90%?

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Based on the following information, provide the appropriate answer. Assume alpha = 0.05. The yield of a chemical process is being studied. From previous experience with this process the standard deviation of yield is known to be 4%. The past 5 days of plant operation have resulted in the following yields: 92.1, 87.8, 91.3, 89.6, and 93.3%.

a) Create a two-sided confidence interval for the true mean yield.

b) Is there sufficient evidence to conclude the mean yield is not 90%?

c) What sample size would be required to detect a true mean yield of 92% with probability 0.95?

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