The pH scale measures the amount of alkalinity or acidity in a liquid and ranges from 0-14. 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
High variability in the pH readings across the swimming pool can be problematic. The following data shows seven pH readings that were taken at the Wilson Community Pool from different locations at 10 A.M. this morning.7.0 6.9 7.2 7.1 7.4 7.4 7.3The pool management would like to test the hypothesis that the standard deviation of the pH readings across the pool is less than 0.40. The sample standard deviation is ________.A) 0.195
B) 0.240
C) 0.297
D) 0.358
A
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