For each of the following, calculate the z-statistic. (Round your answers to two decimal places.) (a) sample size n = © 30; sample proportion p = 0.55 z = = Hop 0.50 H: p = 0.50 (b) sample size n = © 60; sample proportion p = 0.20 Z = = Ho: P 0.25 Ha: p < 0.25

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