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 a² and the population standard deviation a. Use a 90% level of confidence. Assume that the population has a normal distribution. n = 23 s=12 grains per gallon What is the confidence interval for the population variance o²? (Round to one decimal place as needed.)

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Please find the confidence interval and standard deviation
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 σ. Use a 90%
level of confidence. Assume that the population has a normal distribution.
n=23
s = 12 grains per gallon
What is the confidence interval for the population variance o²?
(Round to one decimal place as needed.)
Transcribed Image Text: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 σ. Use a 90% level of confidence. Assume that the population has a normal distribution. n=23 s = 12 grains per gallon What is the confidence interval for the population variance o²? (Round to one decimal place as needed.)
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