Part 1 Of 3 Points: 0 of 1 The mean and standard deviation of a random sample of n measurements are equal to 33.7 and 3.4, respectively. U a. Find a 95% confidence interval for p if n = 121 b. Find a 95% confidence interval for u if n = 484. ed 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 coefficient fixed? a. The 95% confidence interval for u if n = 121 is approximately (Round to three decimal places as needed.)