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Just a note

F-test & t-test of differences due to treatment effect, then confidence interval of treatment effect.

> # test ratio of sample variances > p*2 # 2-tailed P-value [1] 0.6502243 > # EQ var t-test > p*2 # 2-tailed P-value [1] 1.613001e-05

> # mean difference due to treatments > (dt=mean(c(g1t1-g1t2,g2t2-g2t1))) [1] 17.75