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Difference in the chromium level in the stream

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Reference no: EM131319744

Two sets of chromium analyses were performed on water samples from a stream that runs near a chromium plating plant:

                 Before the spill                                After the spill

Mean:           0.95 ppm Cr                                      1.10 ppm

N                         5                                                      6

S                 0.05 ppm                                           0.08 ppm

Could it be stated, at the 95% confidence level, that after and before the spill there was no difference in the chromium level in the stream?

Reference no: EM131319744

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