【单选题】【消耗次数：1】
下列变量的观测结果属等级资料的是（）。
①
白细胞计数
②
住院天数
③
门诊就诊人数
④
患者的病情分级
⑤
各临床科室的患者数
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根据样本资料算得健康成人白细胞计数的95%可信区间为7.2-9.1×10（9）/L，其含义是
①
总体中有95%的观察值在此范围内
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样本中有95%的观察值在此范围内
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while
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that
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that
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which
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whether
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There; that
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