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9) The maximum level of nitrite allowed is 0.5 mg.L . Dr. Therrien wants to know the number of water samples needed to declare with

9) The maximum level of nitrite allowed is 0.5 mg.L . Dr. Therrien wants to know the number of water samples needed to declare with a probability of 0.9 that there is an excess in nitrite level (a = 0.01) when the population mean is 0.1 mg.L above the maximum level allowed. It is known that the population variance is equal to 0.04 (mg.L-]). 17

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