An industrial company claims that the mean pH level of the water in a nearby river is 6.8. You randomly select 19 water samples and measure the pH of each. The sample mean and the sample standard deviation are 6.7 and 0.24, respectively. Is there enough evidence at α = 0.05 to reject the claim that the pH level is 6.8? Assume a normally distributed population. b. You want to estimate the mean pH level of the water in a nearby river. You randomly select 19 water samples and measure the pH of each. The sample mean is 6.7 and the sample standard deviation is 0.24. Construct a 95% confidence interval for the true mean pH level. Explain how your confidence interval supports the decision you made in the hypothesis test in the previous question.

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