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1) first stream has mean pH level of 6.8 with sd 2.3, control stream mean pH 9.2 with sd 1.5 assume both independent. construct 95%

1) first stream has mean pH level of 6.8 with sd 2.3, control stream mean pH 9.2 with sd 1.5

assume both independent. construct 95% confidence interval from the difference between the 2 means

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