例題：

　二群の分散が等しいといえるかどうか，有意水準 5% で両側検定しなさい。

gr1	22.4	19.7	23.6	16.9	17.3	20.0	18.5	19.9	21.0	16.9
gr2	20.5	21.5	19.3	21.1	16.8	18.2	20.1	22.7	17.7	17.5

R による解析

> gr1 <- c(22.4, 19.7, 23.6, 16.9, 17.3, 20.0, 18.5, 19.9, 21.0, 16.9) # 第一群
> gr2 <- c(20.5, 21.5, 19.3, 21.1, 16.8, 18.2, 20.1, 22.7, 17.7, 17.5) # 第二群

> var.test(gr1, gr2)

	F test to compare two variances

data:  gr1 and gr2 
F = 1.3701, num df = 9, denom df = 9, p-value = 0.6466
alternative hypothesis: true ratio of variances is not equal to 1 
95 percent confidence interval:
 0.3403068 5.5159069 
sample estimates:
ratio of variances 
          1.370073