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Math-K300 Spring 2022 Online Kierstyn Cochran 03/26/22 6:37 PM (?) E Homework: Section 6.4 Confidence Intervals for Question 12, 6.4.19-T HW Score: 38.64%, 8.5 of 22 points Variance and Part 1 of 4 Points: 0 of 1 Save As part of a water quality survey, you test the water hardness in several randomly selected streams. The results are shown below. Construct a confidence interval for the population variance of and the population standard deviation o, Use a 90% level of confidence. Assume that the population has a normal distribution. n= 18 s = 14 grains per gallon What is the confidence interval for the population variance o-? ()(Round to one decimal place as needed.)