Use technology to construct the confidence intervals for the population variance 2 and the population standard deviation . Assume the sample is taken from a normally distributed population. c=0.95,s2=5.76,n=28 The confidence interval for the population variance is (Round to two decimal places as needed.) 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 2 and the population standard deviation . Use a 90% level of confidence. Assume that the population has a normal distribution. n=17s=12grainspergallon What is the confidence interval for the population variance 02 ? (Round to one decimal place as needed.)