Question: Repeat Exercise 12 IQ and Lead by assuming that the two population standard deviations are equal, so 1 = 2 . Use the

Repeat Exercise 12 “IQ and Lead” by assuming that the two population standard deviations are equal, so σ₁ = σ₂. Use the appropriate method from Part 2 of this section. Does pooling the standard deviations yield results showing greater significance?

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