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 95% level of confidence. Assume that the population has a normal distribution. n = 21 s = 14 grains per gallon What is the confidence interval for the population variance o2? (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal places as needed.) O A. With 95% confidence, it can be said that the population variance is less than O B. With 95% confidence, it can be said that the population variance is between and O C. With 5% confidence, it can be said that the population variance is greater than O D. With 5% confidence, it can be said that the population variance is between and What is the confidence interval for the population standard deviation o? ((Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal places as needed.) O A. With 95% confidence, you can say that the population standard deviation is between O B. With 95% confidence, you can say that the population standard deviation is less than and grains per gallon. grains per gallon. O C. With 5% confidence, you can say that the population standard deviation is greater than O D. With 5% confidence, you can say that the population standard deviation is between grains per gallon. and grains per gallon