Find the z calc test statistic for each hypothesis test.,a. x-bar = 242, ?0 = 230, ? = 18, n = 20,b. x-bar = 3.44, ?0 = 3.50, ? = 0.24, n = 40,c. x-bar = 21.02, ?0 = 20.00, ? = 2.52, n = 30

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