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Find the critical and observed z-values

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A random sample of 20 observations produced a sample mean of 9.5. Find the critical and observed z-values for each of the following and test each hypothesis at α = 0.05. The underlying population standard deviation is known to be 3.5 and the population distribution is normal:

a. H0: µ = 8.75; H1: µ ≠ 8.75

b. H0: µ = 8.75; H1: µ > 8.75

Reference no: EM132394164

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