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A random sample of 138 observations produced a sample mean

A random sample of 138 observations produced a sample mean of 30. Find the critical and observed values of z for the following test of hypothesis using α=0.1. The population standard deviation is known to be 9 and the population distribution is normal.

H0: μ=28 versus H1: μ≠28.

Round your answers to two decimal places.

z_{critical left} =

z_{critical right} =

z_observed =

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