napter 09, Section 9.2, Problem 020a random sample of 132 observations produced a sample mean of 30. Find the critical and observed values of z for the following test of hypo" = 0.01. The population standard deviation is known to be 9 and the population distribution is normal. D:H = 28 versus H: µ # 28. und your answers to two decimal places. itical left

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