2:52 4 . '2: [3' B myopenmath.com (9 1hr58mins X Progress saved Submit and End 15' 0 Question 10 v 81 pt '0 1 G) Details 8.2 Margin of Error for Mean u with 0 Unknown (t- table) If n = 13, j = 40, and s = 7, find the margin of error at a 95% confidence level Give your answer to two decimal places. E = l: > Next Question 2:52 4 O myopenmath.com 1hr58mins X Progress saved Submit and End VO Question 11 > 1 pt 9 1 0 Details 8.2 Critical Value for Mean u with o Unknown (t- table) For a confidence level of 95% with a sample size of 31, find the critical value to. Round to 4 decimal places tc > Next Question2:52 4 . '2: [3' B myopenmath.com Mastery Test #4 14 points possible 0/14 answered (9 1hr58mins X Progress saved Submit and End 15' 0 Question 9 v 81 pt '0 1 (D Details 8.1 Minimum Sample Size for Mean u with 0 Known (Z-table) You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately a = 38.4. You would like to be 95% confident that your estimate is within 5 of the true population mean. How large of a sample size is required? Round up to the next whole number. > Next