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- Using the z-table , find the critical value (or values) for the two-tailed test with =α0.09. Round to two decimal places, and enter the answers separated by a comma if needed.Using the z-table, find the critical value with α = 0.10 for a left-tailed test.find the critical values for left-tailed z test with = 0.06. include a graph with your answer. Fine the critical value(s) is (are) =