Minitab内输入一组正态分布数据,选择概率图,选择置信区间为95% ,minitab会自动给出各个百分位数95%置信区间的上下限。我现在的疑问是该上下限是如何计算得出的?附(Minitab计算得到的数据 如下所示)
百分比 C1 下限 上限
1 7.2985 6.5104 8.0865
2 7.6075 6.8861 8.3288
3 7.8035 7.1231 8.4839
4 7.9510 7.3006 8.6014
5 8.0709 7.4443 8.6976
6 8.1731 7.5661 8.7800
7 8.2626 7.6725 8.8527
8 8.3428 7.7674 8.9181
9 8.4156 7.8534 8.9779
10 8.4828 7.9322 9.0333
20 8.9814 8.5078 9.4550
30 9.3410 8.9077 9.7743
40 9.6483 9.2360 10.0605
50 9.9354 9.5298 10.3411
60 10.2226 9.8104 10.6348
70 10.5299 10.0966 10.9631
80 10.8894 10.4159 11.3630
90 11.3881 10.8376 11.9386
91 11.4552 10.8929 12.0175
92 11.5281 10.9527 12.1035
93 11.6083 11.0182 12.1984
94 11.6978 11.0908 12.3048
95 11.7999 11.1732 12.4266
96 11.9199 11.2694 12.5703
97 12.0674 11.3870 12.7477
98 12.2634 11.5421 12.9847
99 12.5724 11.7843 13.3605