(Answered) Suppose that we wish to estimate the average daily

Statistics

Suppose that we wish to estimate the average daily pollution in Lake Erie. The daily yield, recorded for n = 50 days, produced a mean and standard deviation equal to y = 871 tons and s = 21 tons, respectively.

a. Estimate the 95% confidence interval for the average daily yield.

b. How many observations would be required to reduce the confidence interval by 10%?

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