If the Underlying Populations Cannot Be Assumed to Be Normal

question 33

Multiple Choice

If the underlying populations cannot be assumed to be normal, then by the central limit theorem, the sampling distribution of ₁ - ₂ is approximately normal only if both sample sizes are sufficiently large-that is, when ________.

• A) n₁ + n₂ = 30
• B) n₁ + n₂ ≥ 30
• C) n₁ = 30 and n₂ = 30
• D) n₁ ≥ 30 and n₂ ≥ 30

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