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 o² and the population standard deviation o. Use a 95% level of confidence. Assume that the population has a normal distribution. n = 22 s=13 grains per gallon What is the confidence interval for the population variance o²? ((Round to one decimal place as needed.) '

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