• 2022-06-16
    某工厂生产滚珠,从某日生产的产品中随机抽取 9 个,测得直径[tex=2.571x1.357]WjseTLDPuNQ7B0t1S0jb6A==[/tex]如下:[tex=25.286x1.357]tOuhNvizKyRZPn+XCdGxL3lFsJTa+uWTErIATE4sWU5wsFBch4Ml4hy4GoZjSD9WWNnrsIT99nPFZlWPoEkFnQ7VIWM06cnleRcu9Qujjl/6u9IfrP2zpJACrL2AnJQe[/tex]设滚珠直径服从正态分布[tex=3.929x1.571]gORhU/2TMGLbpqNyfyzmZ6k+pBGdBkdAl/WqEq1GQaA=[/tex],求直径均值[tex=0.643x1.0]R8j6nFNrQJBYHOT5c6hCaw==[/tex]的置信水平为[tex=1.786x1.0]L31gvkuUIdeYrFQQ/WabHQ==[/tex]的置信区间,如果未知[tex=0.571x0.786]KMF8QHqVjNLkn7nK5uaSag==[/tex].
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