[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fgGYWT-xvT7TSJ-PpndWihgCoZRE9syzbALcFa3salX8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":13,"question":20,"related":21,"source":32,"type":33},[],"2024-12-16 15:03:49",171451685,[8,9,10,11,12],"3.64±1.96×1.20","3.64±1.20","3.64±1.96×1.20 \u002F√200","3.64±2.58×1.20 \u002F√200","3.64±2.58×1.20",{"count":14,"courseId":15,"courseImg":16,"courseName":17,"workId":18,"workName":19},19,"0e692e95d83b3eea1d82f5b68a9394ef","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0f7ad9a252d1a3e32924e6efae33ec2e.png","医学统计学","work_39648736","第六章 参数估计与假设检验","某地抽取正常成年人200名,测得其血清胆固醇的均数为3.64mmol\u002FL,标准差为 1.20mmol\u002FL,则该地正常成年人血清胆固醇均数95%的置信区间是( )",[22,34,44,54,64,74,84,87,97,107],{"answer":23,"createTime":5,"id":24,"options":25,"question":31,"source":32,"type":33},[],171451675,[26,27,28,29,30],"t 分布曲线的形态变化与自由度ν有关","t 分布是以 0 为中心的对称分布","当ν→ ∞时,t 分布的极限分布就是标准正态分布","t分布曲线下面积 95% 的界值会随自由度大小不同而变化","ν相同时,| t | 值越小,P 值越小","关于 t 分布图形,以下说法错误的是( )","v1",0,{"answer":35,"createTime":5,"id":36,"options":37,"question":43,"source":32,"type":33},[],171451676,[38,39,40,41,42],"增大样本含量","减小样本含量","按原来的样本含量重新抽样","去掉取值比较大的观察值","控制偏倚","当置信度一定时,( )可以减小置信区间的宽度",{"answer":45,"createTime":5,"id":46,"options":47,"question":53,"source":32,"type":33},[],171451677,[48,49,50,51,52],"n 越小,表示用该样本估计总体均数越可靠","σx 越大,表示用该样本估计总体均数越可靠","σx 越小,表示用该样本估计总体均数越可靠","S 越小,表示用该样本估计总体均数越可靠","S 越大,表示用该样本估计总体均数的可靠性越差","对总体均数μ 进行点估计时,( )",{"answer":55,"createTime":5,"id":56,"options":57,"question":63,"source":32,"type":33},[],171451679,[58,59,60,61,62],"X1 = X2 ,S12 = S22","进行两样本 t 检验,必然得出差别无统计学意义的结论","进行两样本方差齐性的 F 检验,必然得出方差齐的结论","分别由甲、乙两样本求出的总体均数的95% 置信区间,很可能有重叠","由甲、乙两样本均数之差求出的总体均数的95% 置信区间,必然包括 0","甲、乙两人分别从随机数字表抽得 30 个(各取两位数字)随机数字作为两个样本,求得X1 ,S12 ,X2 ,S22 ,则理论上( )",{"answer":65,"createTime":5,"id":66,"options":67,"question":73,"source":32,"type":33},[],171451681,[68,69,70,71,72],"0.802±1.64×0.083","0.802 ± 1.96 × 0.083","0.802±2.58×0.083","> 0.802 -1.64 × 0.083","< 0.802+1.64×0.083","用某种中成药治疗高血压患者 100 名,总有效率为80.2%,标准误为 0.083,则总有效率的 95%置信区间估计为( )",{"answer":75,"createTime":5,"id":76,"options":77,"question":83,"source":32,"type":33},[],171451683,[78,79,80,81,82],"估计总体中有 95% 的观察值在此范围内","总体均数在该区间的概率为 95%","样本中有 95% 的观察值在此范围内","该区间包含样本均数的可能性为 95%","该区间包含总体均数的可能性为 95%","根据样本资料算得健康成人白细胞计数的 95% 置信区间为 7.2×109\u002FL-9.1×109\u002FL,其含义是( )",{"answer":85,"createTime":5,"id":6,"options":86,"question":20,"source":32,"type":33},[],[8,9,10,11,12],{"answer":88,"createTime":5,"id":89,"options":90,"question":96,"source":32,"type":33},[],171451686,[91,92,93,94,95],"检验参数估计的准确度","检验样本统计量是否不同","检验样本统计量与总体参数是否不同","检验总体参数是否不同","检验样本的 P 值是否为小概率","假设检验的目的是( )",{"answer":98,"createTime":5,"id":99,"options":100,"question":106,"source":32,"type":33},[],171451687,[101,102,103,104,105],"两样本均数差别越大","两总体均数差别越大","认为两样本均数之间有差别的统计学证据越充分","认为两总体均数不同的统计学证据越充分","Ⅰ类错误的概率越大","两样本均数比较,差别有统计学意义时,P 值越小,说明( )",{"answer":108,"createTime":5,"id":109,"options":110,"question":116,"source":32,"type":33},[],171451688,[111,112,113,114,115],"检验水准必须设为 0.05","必须采用双侧检验","必须根据样本大小选择检验水准","必须建立原假设","要说明原假设正确,必须计算P 值","关于假设检验,正确的说法是( )"]