Question

What is the minimum sample size needed in order to use normal approximations for an estimate about a population, given a probability of success of 10 percent?(1 point)

Answer 1

Use the rule np ≥ 10 and n(1 − p) ≥ 10. With p = 0.10, np = 0.10n ≥ 10 ⇒ n ≥ 100 (the n(1 − p) condition is then satisfied). So minimum n = 100.