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单选题设总体(n已知),是来自总体的样本,为样本均值,则未知参数的矩估计量为=( )

A.

B.

C.

D.

学科：默认课程

时间：2025-12-20 16:10:39

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设总体<img src="https://tihai-oss-cloud.itihey.com/img/add11bd9d6a98f23881622c8e2811a7a.png">服从参数为<img src="https://tihai-oss-cloud.itihey.com/img/bcf39d8d5d1572b94a58ef617816f0e5.png">的泊松分布,其中<img src="https://tihai-oss-cloud.itihey.com/img/e4c780cdde50b2d37d3c25621b4d0c29.png">为未知,<img src="https://tihai-oss-cloud.itihey.com/img/957d9b42e37d91b0f39206a6a7eebdd1.png">为来自总体<img src="https://tihai-oss-cloud.itihey.com/img/add11bd9d6a98f23881622c8e2811a7a.png">的样本,<img src="https://tihai-oss-cloud.itihey.com/img/423a1f5194d2bb7ba0b3a468480fb86c.png">为样本均值,则<img src="https://tihai-oss-cloud.itihey.com/img/bcf39d8d5d1572b94a58ef617816f0e5.png">的矩估计量为<img src="https://tihai-oss-cloud.itihey.com/img/146ef4bffefa607a49ea3969a4c9305f.png">=( )

A. <img src="https://tihai-oss-cloud.itihey.com/img/c4e6cdcb4f8c928b894ab04749db352b.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/8992107d98ebf981063405642815cfd9.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/91e3a88a7e93b0a68c5b7ea88f0d2c99.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/423a1f5194d2bb7ba0b3a468480fb86c.png">

设总体<img src="https://tihai-oss-cloud.itihey.com/img/3624c8a618f35d219db27abcb08d36e6.png">(n已知),<img src="https://tihai-oss-cloud.itihey.com/img/957d9b42e37d91b0f39206a6a7eebdd1.png">是来自总体<img src="https://tihai-oss-cloud.itihey.com/img/add11bd9d6a98f23881622c8e2811a7a.png">的样本,<img src="https://tihai-oss-cloud.itihey.com/img/423a1f5194d2bb7ba0b3a468480fb86c.png">为样本均值,则未知参数<img src="https://tihai-oss-cloud.itihey.com/img/9549862d73571c274658bf287d07734e.png">的矩估计量为<img src="https://tihai-oss-cloud.itihey.com/img/124ea634c6b9db9a4647d0e087fdffef.png">=( )

A. <img src="https://tihai-oss-cloud.itihey.com/img/423a1f5194d2bb7ba0b3a468480fb86c.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/5641b145a753e594f6476289fb6e0094.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/a552ad5c697da3e6134ffcfd0431280d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/c4e6cdcb4f8c928b894ab04749db352b.png">

设总体<img src="https://tihai-oss-cloud.itihey.com/img/add11bd9d6a98f23881622c8e2811a7a.png">在区间<img src="https://tihai-oss-cloud.itihey.com/img/e65edb393fff2593e9f71c798175846f.png">上服从均匀分布,<img src="https://tihai-oss-cloud.itihey.com/img/772b868511a5c10062881efc842afbe0.png">为未知参数,从总体<img src="https://tihai-oss-cloud.itihey.com/img/add11bd9d6a98f23881622c8e2811a7a.png">中抽取样本<img src="https://tihai-oss-cloud.itihey.com/img/957d9b42e37d91b0f39206a6a7eebdd1.png">,<img src="https://tihai-oss-cloud.itihey.com/img/423a1f5194d2bb7ba0b3a468480fb86c.png">为样本均值,则参数<img src="https://tihai-oss-cloud.itihey.com/img/f3f55a1fb419a0fd628bae01883f3eec.png">的矩估计量为<img src="https://tihai-oss-cloud.itihey.com/img/baf475f3deac655b0b242aeca7fb5db1.png">=( )

A. <img src="https://tihai-oss-cloud.itihey.com/img/8992107d98ebf981063405642815cfd9.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/91e3a88a7e93b0a68c5b7ea88f0d2c99.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/9ded05cc049a8fc50ee3f4ffdc04ac27.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/423a1f5194d2bb7ba0b3a468480fb86c.png">

设总体<img src="https://tihai-oss-cloud.itihey.com/img/add11bd9d6a98f23881622c8e2811a7a.png">服从参数为<img src="https://tihai-oss-cloud.itihey.com/img/bcf39d8d5d1572b94a58ef617816f0e5.png">的指数分布,其中<img src="https://tihai-oss-cloud.itihey.com/img/e4c780cdde50b2d37d3c25621b4d0c29.png">为未知,<img src="https://tihai-oss-cloud.itihey.com/img/957d9b42e37d91b0f39206a6a7eebdd1.png">为来自总体<img src="https://tihai-oss-cloud.itihey.com/img/add11bd9d6a98f23881622c8e2811a7a.png">的样本,则<img src="https://tihai-oss-cloud.itihey.com/img/bcf39d8d5d1572b94a58ef617816f0e5.png">的最大似然估计量为<img src="https://tihai-oss-cloud.itihey.com/img/146ef4bffefa607a49ea3969a4c9305f.png">=( )

A. <img src="https://tihai-oss-cloud.itihey.com/img/8992107d98ebf981063405642815cfd9.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/c4e6cdcb4f8c928b894ab04749db352b.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/91e3a88a7e93b0a68c5b7ea88f0d2c99.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/423a1f5194d2bb7ba0b3a468480fb86c.png">

设<img src="https://tihai-oss-cloud.itihey.com/img/09740ff26380d6f9730b26e9ba922f00.png">为总体<img src="https://tihai-oss-cloud.itihey.com/img/a62d968c6962b408004ad07e2ee2eacd.png">的样本观察值,<img src="https://tihai-oss-cloud.itihey.com/img/890a6daa320e03856d1c00e3ac868290.png">为样本均值,则未知参数<img src="https://tihai-oss-cloud.itihey.com/img/88914d215641cc1041a935ed5092ea33.png">的最大似然似计值为<img src="https://tihai-oss-cloud.itihey.com/img/ce822b0cf011058609cbcbdd39d8ed64.png">=( )

A. <img src="https://tihai-oss-cloud.itihey.com/img/2761d6f29e972c086bfc25b124fd1706.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/79b043d86d9783dbebb84179c7b2af60.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/b04b77affb67534c833779afa8b91097.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/48e4ba0891099fb2fc133d861a452612.png">

在亚硝酸钠滴定法中,加入溴化钾的目的是( )(1.4)

A. 能生成大量的NO+,从而加快反应速率B. 增加K+的浓度,以加快反应速率C. 使滴定终点的指示更明显D. 利用生成的Br2的颜色指示终点

杂环类药物较易建立紫外分析方法,是由于( )(1.4)

A. 易于进行化学反应B. 易于氧化还原显色C. 易于改变结构发生荧光D. 分子中含有芳香结构和O、N、S等杂原子具有丰富的光谱信息E. 易于分解

依据药品的概念,以下不属于药品的是:(1.3)

A. 中药材B. 化学原料药C. 保健品D. 血清制品

对氯酚是什么药物的特殊杂质( )(1.4)

A. 阿司匹林B. 氯贝丁酯C. 对氨基水杨酸钠D. 布洛芬E. 对乙酰氨基酚

对乙酰氨基酚由于贮存不当发生水解或酰化不完全均易引入对氨基酚,因此需要控制限量,其方法为( )(1.4)

A. 在酸性条件下与亚硝酸钠反应B. 在酸性条件下与三氯化铁反应C. 高效液相色谱法D. 在碱性条件下与亚硝基铁氰化钠生成蓝色配位化合物E. 与氨制硝酸银反应

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