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An industrial company claims that the mean pH level of the water in a nearby river...

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?

State if it is a one-tailed or two-tailed test and draw your distribution and designate your rejection region using critical values.

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TOPIC:One sample t-test for population mean.

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