Question

The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed with σ = 3. The past five days of plant operation have resulted in the following percent yields: 91.6, 88.75, 90.8, 89.95, and 91.3. How large a sample is needed so that you would be 95% sure that the true mean is only off by less than 0.25 of the sample mean.

Answer 1

Answer:

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