The Water Department checks the city water supply on a regular basis for
contaminants such as...
Mathematics, 05.05.2020 04:14 azzyla2003
The Water Department checks the city water supply on a regular basis for
contaminants such as xylenes. The Water Department takes 200 samples
and estimates that the concentration of xylenes in your drinking water is 3.5
ppb (parts per billion), with a standard deviation of 0.2 ppb.
Assuming the samples were random and unbiased, how much confidence
can you have in this data?
Answers: 2
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