critical value的具体数值要到常规的统计表格里去找,比如Critical values of chi-square可以从下面这本书里查:
Fisher & Yates. Statistical Tables for Biological, Agricultural and Medical Research. Longman Group Ltd, London, 1974, 6th ed.
不过很多系统讲统计学和统计方法的书里都有附表的,比如
Hatch & Farhardy. 1982. Research Design and Statistics for Applied Linguistics. 这本书里的上述那个表就是来自上面那本书