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n = 8 个公寓的日用水量（升）：5.2 | 4.8 | 5.5 | 4.9 | 5.1 | 5.3 | 4.7 | 5.0。构造95%置信区间。
n = 8 个公寓的日用水量（升）：5.2 | 4.8 | 5.5 | 4.9 | 5.1 | 5.3 | 4.7 | 5.0。构造95%置信区间。
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