A random sample of 121 observations produced a sample mean of 33. 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 9 and the population distribution is normal. Ho: H = 28 versus H₁: μ # 28. Round your answers to two decimal places. Zcritical left Zcritical right -1.44 144 Zobserved - i 1.94

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