请教：Minitab中的ANOVA结果的解释

我刚开始学习ANOVA，有很多地方不明白，特地请教各位前辈。

**在Minitab中进行单因素方差分析，我得出的结果如下：
One-way ANOVA: Days versus Center

Source DF SS MS F P
Center 2 114.63 57.32 39.19 0.000
Error 299 437.28 1.46 ·········· Error表示什么？
Total 301 551.92

S = 1.209 R-Sq = 20.77% R-Sq(adj) = 20.24%


Individual 95% CIs For Mean Based on ···这句话是
Pooled StDev 什么意思？
Level N Mean StDev -----+---------+---------+---------+----
Central 99 3.984 1.280 (----*---)
Eastern 101 4.452 1.252 (----*----)
Western 102 2.981 1.090 (----*---)
-----+---------+---------+---------+----
3.00 3.50 4.00 4.50

上面这个图怎么看？？
Pooled StDev = 1.209


Tukey 95% Simultaneous Confidence Intervals ·Tukey是指T检验吗？
All Pairwise Comparisons among Levels of Center

Individual confidence level = 98.01% ····表示什么样的置信水平？


Center = Central subtracted from:

Center Lower Center Upper ---------+---------+---------+---------+
Eastern 0.068 0.468 0.868 (---*---)
Western -1.402 -1.003 -0.603 (---*---)
---------+---------+---------+---------+
-1.0 0.0 1.0 2.0


Center = Eastern subtracted from:

Center Lower Center Upper ---------+---------+---------+---------+
Western -1.868 -1.471 -1.073 (---*---)
---------+---------+---------+---------+
-1.0 0.0 1.0 2.0

结果中有部分东西看不懂，特地请教各位前辈。[/**