In this section, we introduced the pooled t-test, which provides a method for comparing two population means.
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In this section, we introduced the pooled t-test, which provides a method for comparing two population means. In deriving the pooled t-test, we stated that the variable z = (x¯1 − x¯2) − (μ1 − μ2)
σ
√(1/n1) + (1/n2)
cannot be used as a basis for the required test statistic because σ is unknown. Why can’t that variable be used as a basis for the required test statistic?
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