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Based on the sample data on the PH of rain in Ingham County, Michigan: 5.0   4.5  ...

Based on the sample data on the PH of rain in Ingham County, Michigan:

5.0   4.5   6.0   7.0   5.8   3.7   6.5   7.8

Find a two-sided 90% confidence interval for the standard deviation of PH. Assume that the sample data are from a normal distribution.

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