A random sample of 106 observations produced a sample mean of 33. Find the critical and observed values of z for the following test of hypothesis using a = 0.025. The population standard deviation is known to be 7 and the population distribution is normal. Ho: μ = 28 versus H₁:μ ‡ 28. Round your answers to two decimal places. Zcritical left = Zcritical right Zobserved = =

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