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n = 20 个家庭的月食品支出:\bar X = R 500 (巴西雷亚尔), s = R$,50$(巴西雷亚尔)。使用 Student t 构造95%置信区间。
n = 20 个家庭的月食品支出:\bar X = R 500 (巴西雷亚尔), s = R$,50$(巴西雷亚尔)。使用 Student t 构造95%置信区间。
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