The pH scale measures the amount of alkalinity or acidity in a liquid and ranges from 0 to 14. The ideal pH for a swimming pool is 7.2. A pH that is too high or low can cause discomfort for the swimmers, especially in the eyes. Chemicals need to be added to the water to adjust the pH to the desired level. Fifteen pH readings were taken at the Wilson Community Pool from different locations at 10: 00 a. m. this morning. The standard deviation for the pH reading from this sample was 0.45.
a. Using α = 0.05, perform a hypothesis test to determine if the standard deviation for the pH readings at 10: 00 a. m. equals 0.30.
b. Verify your results using PHStat.
c. Interpret the p value obtained from the software.

  • CreatedJuly 28, 2015
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