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The mean and standard deviation of a random sample of n measurements are equal to 34.5 and 3.8, respectively. a . Find a 95% confidence

The mean and standard deviation of a random sample of n measurements are equal to 34.5 and 3.8, respectively.

a. Find a 95% confidence interval for if =144

b. Find a 95% confidence interval for if nequals=576

c. Find the widths of the confidence intervals found in parts a and b. What is the effect on the width of a confidence interval of quadrupling the sample size while holding the confidence coefficientfixed?

a. The 95% confidence interval for if equals=144 is approximately

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