The Water Department checks the city water supply on a regular basis for contaminants such as trihalomethanes (THMs). The Water Department takes 200 samples and estimates that the concentration of THMs in your drinking water is 3 ppb (parts per billion), with a standard deviation of 0.3 ppb. Assuming the samples were random and unbiased how much confidencr can you have in this data? A. 95% confident the average concentration of PCBs in the water supply is between 2.4 ppb and 3.6 ppb. B. 68% confident the average concentration of PCBs in the water supply is between 2.9 ppb and 3.1 ppb ...
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