§7.5正态总体均值和方差的区间估计 x分布表 n =0.25 0.10 0.05 0.025 0.01 0.005 1 1.323 2.706 3.841 5.024 6.635 7.879 2 2.773 4.605 5.991 7.378 9.210 10.597 3 4.108 6.251 7.815 9.348 11.345 12.838 4 5.385 7.779 9.488 11.143 13.277 14.860 5 6.626 9.236 11.071 12.833 15.086 16.750 6 7.841 10.645 12.592 14.449 16.812 18.548 7 9.037 12.017 14.067 16.013 18.475 20.278 8 10.219 13.362 15.507 17.535 20.090 21.955 9 11.389 14.684 16.919 19.023 21.666 23.589 10 12.549 15.987 18.307 20.483 23.209 25.188 11 13.701 17. 21.920 24.725 26.757 12 14.845 18. 27.488 23.337 26.217 28.299 13 15.984 19. 24.736 27.688 29.891 14 17.117 20.064 23.685 26.119 29.141 31.319 15 18.245 22.307 24.996 27.488 30.578 32.801 16 19.369 23.542 26.296 28.845 32.000 34.267 26/48=0.25 0.10 0.05 0.025 0.01 0.005 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1.323 2.773 4.108 5.385 6.626 7.841 9.037 10.219 11.389 12.549 13.701 14.845 15.984 17.117 18.245 19.369 2.706 4.605 6.251 7.779 9.236 10.645 12.017 13.362 14.684 15.987 17.275 18.549 19.812 20.064 22.307 23.542 3.841 5.991 7.815 9.488 11.071 12.592 14.067 15.507 16.919 18.307 19.675 21.026 22.362 23.685 24.996 26.296 5.024 7.378 9.348 11.143 12.833 14.449 16.013 17.535 19.023 20.483 21.920 23.337 24.736 26.119 27.488 28.845 6.635 9.210 11.345 13.277 15.086 16.812 18.475 20.090 21.666 23.209 24.725 26.217 27.688 29.141 30.578 32.000 7.879 10.597 12.838 14.860 16.750 18.548 20.278 21.955 23.589 25.188 26.757 28.299 29.891 31.319 32.801 34.267 n  2  分布表 27.488 §7.5 正态总体均值和方差的区间估计 26/48