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An industrial waste treatment process guarantees that it will last, on the average, 3 years with...

An industrial waste treatment process guarantees that it will last, on the average, 3 years with a standard deviation of 1 year. If five of these treatment processes treat the same waste and demonstrate lifetimes of 1.9, 2.4, 3.0, 3.5, and 4.2 years, is the manufacturer still convinced that the lifetime of the treatment process has a standard deviation of 1 year? Assume that the treatment process lifetime follows a normal distribution.

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