Question: Nitrite ( NO 2 ) was measured by two methods in rain water and unchlorinated drinking water. Theresults be expressed by mean pm standard

Nitrite (NO2) was measured by two methods in rain water and unchlorinated drinking water. Theresults be expressed by mean \pm standard deviation (number of samples). For each method, does thedrinking water contain significantly more nitrite than the rainwater at the 95% confidence level?

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