Question: The average zinc concentration recovered from a sample of measure- ments taken in 36 different locations in a river is found to be 2.6

The average zinc concentration recovered from a sample of measure- ments taken

The average zinc concentration recovered from a sample of measure- ments taken in 36 different locations in a river is found to be 2.6 grams per milliliter. Find the 95% and 99% confidence intervals for the mean zinc concentration in the river. Assume that the population standard deviation is 0.3 gram per milliliter.

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