Moderate

If n ≥ 30 and _____ then binomial approaches to normal distribution?

Correct answer: B. p = q

  • A. q/p
  • B. p = q
  • C. pq
  • D. p = n

Explanation

When p = q = 0.5 and n is at least 30, both np and nq are sufficiently large, making the binomial distribution reasonably close to normal. More generally, the approximation is judged by np and nq rather than by p = q alone.

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