The following data represent the pH of rain for a random sample of 12 rain dates in Tucker County, West Virginia. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. In Problem 31 from Section 9.2, we found that s = 0.319. Construct and interpret a 95% confidence interval for the standard deviation pH of rainwater in Tucker County, West Virginia.

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4.80 4.77 4.58 5.19 5.05 4.77 4.76 5.72 4.75 5.02 4.74 4.56