A random sample of 132 observations produced a sample mean of 29. Find the critical and observed values of z for the following test of hypothesis using a = 0.01. The population standard deviation is known to be 5 and the population distribution is normal. Ho: H = 28 versus H:u + 28. Round your answers to two decimal places. Zcritical left = Zeritical right = Zobserved =

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