[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$frUHyShSwBkqD0lr4YF_iK97wWesgCVTGg4j-q9oZcfY":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2023-05-22 20:35:57",24561224,[8,9,10,11],"两组受试对象相同","两组治疗方法不同","两组治疗效果不同","两组观察指标相同",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},20,"ac47a0af410af48d49b25cab32278c71","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F31fffd9b1ab8ed93a1abd0aec5eb6142.jpg","医学（卫生）统计学2022-2023-2","4e10e9fefedc4358ad15efb12b70ad55","平时测试-假设检验","将同类高血压病患者若干随机分成两组,一组给予传统医疗方法,另一组给予新医疗方法,以各组治疗前后血压的平均下降值为指标,比较两种医疗方法的效果.关于该研究的设计要求,下列除以____外",[21,33,43,53,62,71,80,89,92,102],{"answer":22,"createTime":5,"id":23,"options":24,"question":30,"source":31,"type":32},[],24561217,[25,26,27,28,29],"t分布是一种连续性分布","是以0为中心的对称分布","t分布就是样本均数的分布","当自由度为无穷大时,t分布就是标准正态分布","t分布的曲线形状固定","关于t分布,以下说法不正确的是","v1",0,{"answer":34,"createTime":5,"id":35,"options":36,"question":42,"source":31,"type":32},[],24561218,[37,38,39,40,41],"中心位置左移","中心位置右移","分布曲线峻峭一些","分布曲线平坦一些","以上都不是","与标准正态分布(z分布)比较,t分布的",{"answer":44,"createTime":5,"id":45,"options":46,"question":52,"source":31,"type":32},[],24561219,[47,48,49,50,51],"P &lt;0.05","P &lt;0.01","P &gt;0.05","P =0.05","P &lt;0.005","两个大样本均数比较的Z检验, |Z|=1.98,则统计结论是",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":31,"type":32},[],24561220,[57,58,59,60],"要求随机样本","适用于任何形式的总体分布","可用于小样本","可用样本标准差S代替总体标准差\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F97e289c96b01cbb041e834b95a3360f9.png\">","关于学生t分布,下面哪种说法不正确( )",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":31,"type":32},[],24561221,[66,67,68,69],"0","1","2","不确定","t分布的均数是多少",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":31,"type":32},[],24561222,[75,76,77,78],"观察值95%的分布范围","总体均数的95%置信区间","总体均数的99%置信区间","样本均数的95%分布范围","公式\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc0207b50e4baa69fbe74e3eb31fc181a.png\">1.96\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F302e005c39383c6a3ca6cf9145d52527.png\">表示",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":31,"type":32},[],24561223,[84,85,86,87],"抽样调查样本量都小","抽样调查是,标准差&sigma;不知道,无法计算标准误,只能计算标准误估计值","基于t分布因为因为总体均数不知道","基于t分布因为t分布更容易计算","在计算总体均数置信区间时,常基于t分布而不是z分布,这是什么原因",{"answer":90,"createTime":5,"id":6,"options":91,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":93,"createTime":5,"id":94,"options":95,"question":101,"source":31,"type":32},[],24561225,[96,97,98,99,100],"选定检验方法和计算检验统计量","确定P值和作出推断性结论","对总体参数的范围作出估计","计算P值","建立假设和确定检验水准","假设检验的一般步骤中不包括以下哪一条",{"answer":103,"createTime":5,"id":104,"options":105,"question":111,"source":31,"type":32},[],24561226,[106,107,108,109,110],"抽样误差估计","点估计","参考值范围估计","区间估计","参数估计和假设检验","由样本均数估计总体均数,宜采用"]