单选题 When analyzing the value of a single normally distributed populations variance, the most appropriate test is a(n):
A. chi-squared test.
B. paired comparison test.
C. F-test.

【正确答案】 A
【答案解析】[解析] 检验单个总体方差是否等于某个数值用开方检验。检验两个正态分布的总体方差是否相等用F检验。检验两个非独立总体的均值之差用配对检验。