设某种元件的寿命 ,其中参数 未知,为估计平均寿命 及方差 ,随机抽取7只元件得寿命为(单位:小时):1575,1503,1346,1630,1575,1453,1950。则 的矩法估计值为。https://img-ph-mirror.nosdn.127.net/vBAMbxx3uGBqBiLWUJRWWw==/6631680193676553683.pnghttps://img-ph-mirror.nosdn.127.net/vKFlL_ovZ5msM_cUGC5s6Q==/6631456992816501185.pnghttps://img-ph-mirror.nosdn.127.net/jeN7752H6T6S_JzCMitNwQ==/6608555265119848391.pnghttps://img-ph-mirror.nosdn.127.net/UGmhcyfr-jiK0f1QJhHeyg==/6631756059979065554.pnghttps://img-ph-mirror.nosdn.127.net/jeN7752H6T6S_JzCMitNwQ==/6608555265119848391.png
举一反三
- 设某种元件的寿命,其中参数未知,为估计平均寿命及方差,随机抽取7只元件得寿命为(单位:小时):1575,1503,1346,1630,1575,1453,1950。则的矩法估计值为。
- 设某种元件的寿命,其中参数未知,为估计平均寿命及方差,随机抽取7只元件得寿命为(单位:小时):1575,1503,1346,1630,1575,1453,1950.则的矩估计为,的矩估计为.
- 设某种元件的寿命 [img=93x26]1802dee3ff86ba2.png[/img],其中参数 [img=36x25]1802dee407f59de.png[/img] 未知,为估计平均寿命 [img=11x18]1802dee411a24f8.png[/img] 及方差 [img=18x21]1802dee41b05b32.png[/img],随机抽取7只元件得寿命为(单位:小时):1575,1503,1346,1630,1575,1453,1950。则 [img=11x18]1802dee411a24f8.png[/img] 的矩法估计值为( )。 A: 1658 B: 1576 C: 1568 D: 1486
- 设某种元件的寿命[img=103x27]1803d9db3130d5b.png[/img],其中参数[img=11x18]1803d9db38c15af.png[/img],[img=18x22]1803d9db41db180.png[/img]未知,随机抽取7只元件得寿命(单位:小时):1575,1503,1346,1630,1575,1453,1950.则[img=11x18]1803d9db4b26aba.png[/img]的矩法估计值为 A: 1576 B: 1568 C: 1486 D: 1658
- 中国大学MOOC: 设http://img-ph-mirror.nosdn.127.net/mAr40Ex9dj7RKIDO0xK-3A==/3750091114817379012.pnghttp://img-ph-mirror.nosdn.127.net/qwxf7Qhyl2gIpW9DHu82HA==/6619385454653355855.png是样本均值,http://img-ph-mirror.nosdn.127.net/JT3hoTnejG6vejzezIDeEg==/6608549767561984903.png是样本方差,http://img-ph-mirror.nosdn.127.net/JLWEQ91n2G2BQ5AGkD_rJA==/1161084278948858061.png是样本二阶中心矩,当http://img-ph-mirror.nosdn.127.net/jeN7752H6T6S_JzCMitNwQ==/6608555265119848391.png未知时,检验http://img-ph-mirror.nosdn.127.net/1kGBCs_IX4J8CfS80X9_Tw==/6632173874400291109.pnghttp://img-ph-mirror.nosdn.127.net/aWQhr7faqo0bSXG3SufJcw==/6632017743749146630.png 在显著水平http://img-ph-mirror.nosdn.127.net/ohfMIFH44HORvasXTiYCqg==/6599281984052422974.png下,http://img-ph-mirror.nosdn.127.net/HS3L-Nc09Pxb9HLQqTsaqQ==/6619246916188684692.png检验使用的统计量是( )