A random sample of 122 observations produced a sample mean of 30. Find the critical and observed values of z for the following test of hypothesis using α = 0.02. The population standard deviation is known to be 6 and the population distribution is normal. Ηο: μ = 28 versus H₁: μ > 28. Round your answers to two decimal places. Zcritical = Zobserved =
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