The acidity or alkalinity of a solution is measured using pH. A pH less than 7 is acidic, while a pH greater than 7 is alkaline. The following data represent the pH in samples of bottled water and tap water.

(a) Which type of water has more dispersion in pH using the range as the measure of dispersion?
(b) Which type of water has more dispersion in pH using the standard deviation as the measure of dispersion?

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7.45 7.64 Tap 7.47 7.69 7.68 7.50 7.10 7.56 7.47 7.45 7.52 7.47 5.23 Bottled 5.15 5.02 5.09 5.26 5.20 5.26 5.21 5.24 5.26 5.13 5.28