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Mathematics, 14.04.2020 23:11 armonilucky11

Local government is worried that runoff from a corporate farm has caused water in a nearby stream to become acidic. The pH is used to measure the acidity/alkalinity of a substance. Pure water, for instance, has a pH of 7, and smaller pH values indicate acidity, while larger values indicate alkalinity. A contractor is hired to test the hypothesis that the water is significantly acidic.
H0: μ = 7
HA: μ < 7
The contractor took 27 water samples and found an average pH of 6.3 with a sample standard deviation of 1.86.
What is the test statistic for this sample? Give your answer to 2 decimal places.

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