Question: For the approximate two-sample t test described in Question 9.2.17, it will be true that vn+m2 Why is that a disadvantage for the approximate test?

For the approximate two-sample t test described in Question 9.2.17, it will be true that vn+m−2 Why is that a disadvantage for the approximate test? That is, why is it better to use the Theorem 9.2.1 version of the t t e s t i f , i n f a c t , σ X2 = σ Y2 ?

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