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A/B 测试：转化率 A = 10%，B = 12%， n = 1000 每组。在 alpha = 0.05 水平上进行比例差异的双尾 z 检验。
A/B 测试：转化率 A = 10%，B = 12%， n = 1000 每组。在 alpha = 0.05 水平上进行比例差异的双尾 z 检验。
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