Suppose for a sample selected from a normally distributed population, XBAR = 68.5 and s = 8. a) Construct a 95% confidence interval for U, assuming n = 16. b) Construct a 90% confidence interval for U assuming n= 16. Is the width of the 90% confidence interval smaller than the width of the 95% confidence interval calculated in part a? if yes, explain. c) Find 95% confidence interval for U assuming n=25. Is the width of the 95% confidence interval for U with n= 25 smaller than the width of the 95% confidence for U with n= 16 calcucalted in part a? If so, Why? Explain. Solution a)+- 3.92 b).