Random sample from a normal population

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Reference no: EM133015334

In attempting to control the strength of the wastes discharged into a Kafue river, an Zamia Sugar has taken a number of restorative measures. The rm claims that they have lowered the oxygen consuming power of their wastes from a previous mean of 450 manganate in parts per million. To test this claim, readings are taken on n = 20 successive days. A sample mean of 312:5 and the sample standard deviation 106:23 are obtained. Assume that these 20 values can be treated as a random sample from a normal population.

Reference no: EM133015334

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