Mathematics, 10.01.2021 20:00 ashiteru123
The Environmental Protection Agency has determined that safe drinking water should contain no more than 1.3 mg/litre of copper. You are testing water from a new source and take 30 water samples. The mean copper content in your samples is 1.36 mg/l and the standard deviation is 0.18 mg/l.
Do these samples provide convincing evidence at the ο‘ = 0.05 level that the water from this source contains unsafe levels of copper? Justify your answer.
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