A random sample of 136 observations produced a sample mean of 30. Find the critical and observed values of z for the following tes of hypothesis using a = 0.02. The population standard deviation is known to be 7 and the population distribution is normal. Ho:u = 28 versus H1: µ > 28. Round your answers to two decimal places. 2.58 Zcritical = 2.55 Zobserved

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