Hi,

*Note: Formula for the test statistic is 

In this case n = 15

Entering the Data into an Excel worksheet column and applying the Data Analysis tool

found  and  for this sampling.

 = -.54/3.873 = -.139

P(t < -.139) = .4447 Or 44.47%

The test results would show that these Ph readings were well within the average

of mu = 8.1, at the 5% significance level 

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