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Construct the confidence interval for the population mean u. c= 0.95. x = 7.4, a =0.5, and n = 56 A 95% confidence interval for u is ( ). (Round to two decimal places as needed;) Question 6, 6.1.29 Homework: Section 6.1 Find the minimum sample size n needed to estimate u for the given values of c, o, and E. c= 0.90, a = 7.6, and E = 1 Assume that a preliminary sample has at least 30 members. n= (Round up to the nearest whole number.) HW Homework: Section 6.1 Question 7, 6.1.31 poir O Find the minimum sample size n needed to estimate u for the given values of c, o, and E. c=0.98, a = 8.2, and E = 2 Assume that a preliminary sample has at least 30 members. n=](Round up to the nearest whole number.)