a Normal distribution with standard deviation σσ = 0.5. A sample of n days finds that the mean pH is x⎯⎯⎯x¯ = 4.8. Give a 95% confidence interval for the mean pH μμ for each sample size n = 5, n = 15, n = 40.
Emissions of sulfur dioxide by industry sett off chemical changes in the atmosphere that result in "acid rain". The acidity of liquids is measured by pH on a scale of 0 to 14. Distilled water has pH 7.0, and lower pH values indicate acidity. Normal rain is somewhat acidic, so acid rain is sometimes defined as rainfall with a pH below 5.0. Suppose that pH measurements of rainfall on different days in a Canadian forest follow a
n = 5: __ to__
n = 15: __to__
n = 40: __to__
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