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dyosang gwapa
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This is 1-Proportion Z-Test with p = 420 / 500 = 0.84 Ho: mean proportion = 0.856 Ha: mean proportion ≠ 0.856 [Since we are using ≠ , this is a two-tailed test] z-statistic = (0.84 - 0.856) / sqrt[ (0.856)(1-0.856) / 500] = -1.019 p-value = (2)P(z <
