• 2022-06-05
    测得两个民族中各8位成年人的身高(单位:cm)如下[tex=28.143x3.643]zdnnLFyBajrp0RrOL8bSmadLrlzmra8MBmEA1NDnzeqPCqTCJ1sC9Ddprj1GlkYqP+Cwts83liWdLs4ec1/GQm4Ml84LorjH3mMjJA7SI3iWctcHTUKt8IVHj3HNcclL5F+hHkj0+3ef60qh2+ItTNsDACbYUiGxd5xuUdjNd8h64YPC+JclFLq54GHfaZtdkmrqCnEhSkVdMv1xJcZMsjdWTvaRojgWpr0lmFbdlsM=[/tex]假设两正态总体的方差相等,求两个民族平均身高之差[tex=3.143x1.143]Xfu9FdKKsg7o07u7dPcwj9xww6gXUKFLXjuRuqB0new=[/tex]的置信水平为[tex=1.857x1.143]6ct+iwoR4UNC8as2/Ebayw==[/tex]的置信区间.