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The following information is available. H 0 : 220 H 1 : < 220 A sample of 64 observations is selected from a normal population.

The following information is available.

H₀ : 220

H₁ : < 220

A sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis using the .025 significance level.

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