Question: 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

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

cannot be used as a basis for the required test statistic because Ïƒ is unknown. Why can't that variable be used as a basis for the required test statistic?

(i 2) (1 2)

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