Question 15 V As you use excel to work these problems, make sure to screen shot your input and output for each problem. Express the confidence interval (247.9, 441.7) in the form of a + ME. 1.7 ) in the C + ME = H Add Work > Next Question. Question 17 You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 43.9. You would like to be 99% confident that your esimate is within 4 of the true population mean. How large of a sample size is required? n = Add Work > Next QuestionQuestion 16 As you use excel to work these problems, make sure to screen shot your input and output for each problem. You intend to estimate a population mean / with the following sample. 32.2 36.5 42.2 63.9 32.8 51.5 You believe the population is normally distributed. Find the 80% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). 80% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places