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  3. 9.) emissions of sulfur dioxide by industry set of

9.) Emissions of sulfur dioxide by industry set off chemical changes in the atmosphere that result...

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9.) Emissions of sulfur dioxide by industry set off chemicalchanges in the atmosphere that result in \"acid rain.\" The acidityof liquids is measured by pH on a scale of 0 to 14. Distilled waterhas pH 7.0, and lower pH values indicate acidity. Normal rain issomewhat acidic, so acid rain is sometimes defined as rainfall witha pH below 5.0. Suppose that pH measurements of rainfall ondifferent days in a Canadian forest follow a Normal distributionwith standard deviationσ= 0.5. A sample of n days finds that themean pH is x= 4.8.


Give a 80 % confidence interval for the mean pH μ when n = 5,n = 15, and n = 40.

n= 5___to___
n = 15___ to___
n = 40 ___to ___

Answer & Explanation Solved by verified expert
3.6 Ratings (669 Votes)
a 48 05n 5020From Table critical Values of Z    See Answer
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