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The mean and standard deviation of a random sample of n measurements are equal to 33.9...

The mean and standard deviation of a random sample of n measurements are equal to 33.9 and 3.3, respectively.

a. Find the lower limit, the upper limit and the margin of error for a 95% confidence interval for m if n = 100.

b. Find the lower limit, the upper limit and the margin of error for  a 95% confidence interval for m if n = 400.

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