Question

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. 20 pH readings were taken at the Wilson Community Pool from different locations at 10 am this morning. The average pH reading from this sample was 6.9 with a standard deviation of 0.45. Determine if corrective action is needed at this pool to adjust the pH value. a = 0.01

can you also show the excel functions for this?

Answer 1

Sole given that the data ý * Sarople was 6.9 ; range from oto 14 * Standard deviation 0.45 * The ideal pt for a Swinning pool y = 7.2 * Alpha 2=0.05 Test statistic 6-9-7.2 0.45 a-l we know that E-25819

By Usha the calculator TINU (0.ol, 14)=-2976842 Critical value t - tis-1,000! 14, 0.005 -2.9768 reject o Here t calculated ů greater than the critical t, we fail to the noll hypothesis. Therefore wilson Community Pool conclude pH value y Equal to Based on they Sample, no Correlative action ý needed that the 7.2. n