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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

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 their pH. The mean and standard deviation are 6.7 and 0.24, respectively. Is there enough evidence to reject the company's claim at a significance level of 0.05? Assume the population is normally distributed

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