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n = 14 samples are taken from a stream; the mean pollutant level is 16.4 mg/l,...

n = 14 samples are taken from a stream; the mean pollutant level is 16.4 mg/l, and the standard deviation is 5.3. Test the hypothesis that the true mean is no different than the "normal" level of 12.5 mg/l. State the null and alternative hypotheses, and use a Type I error level of 5%. (4)

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