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Problem: The quality of the drinking water must be monitored as often as possible. One variable of concern is the pH level, which measures the alkalinity or acidity of the water. A pH below 7.0 is acidic while a pH above 7.0 is alkaline. A pH of 7.0 is neutral. A water-treatment plant is targeting higher than 8.0 pH. Based on 16 random water samples, the mean and standard deviation were found to be: * = 7.6 and s = 0.4. Test the claim using 5% level of significance. Note: Follow the steps in hypothesis testing using traditional or critical value method.
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