Problem 11: A 95% confidence interval for the population mean GPA of students who passed STAT 361 is given by (3.419, 3.981). (a) If we increase the confidence level to 98% while keeping everything else same, what happens to the new confidence interval? Explain. (b) Which confidence interval is more precise? 95% or 99%? Explain. (c) If we use the same 95% confidence level, how do you get a more precise confidence inkerval? Explain.

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