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Could it be stated at the 95 confidence level that after


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?

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Basic Statistics: Could it be stated at the 95 confidence level that after
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