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 2 and the population standard deviation σ. Use a 90% level of confidence. Assume that the population has a normal distribution. n=19 s=16 grains per gallon What is the confidence interval for the population variance o²? (Round to one decimal place as needed.)

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