Independent group T-Test

Equal variances

Null hypothesis : Y and X have the same mean.
Test : Use a two sided test with unequal variances to test equivalence.

R code : t.test(mean(Y), mean(X), paired = FALSE, var.equal = TRUE)

Unequal variances

Null hypothesis : Y and X have the same mean.
Test : Use a two sided test with unequal variances to test equivalence.

Mean difference interval :

R code : t.test(mean(Y), mean(X), paired = FALSE, var.equal = FALSE)

When in doubt, assume independent group and unequal variances!

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