Introduction to Hypothesis Testing
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چکیده
Suppose we are using a pH meter to test acidity/alkalinity of a solution used in a manufacturing process. The pH of pure water is 7.00. For samples in the pH range from about 5 to 9 the meter gives normally distributed readings with • μ equal to the true pH of the sample and • standard deviation σ = 0.20. The meter is tested each morning to make sure it is operating properly: n = 4 samples of pure water are tested. If the average of the four readings is "sufficiently near" 7.00 the meter is deemed to be in proper adjustment, otherwise it is serviced before further use.
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