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 25 percent?(1 point)
Responses

38
38

40
40

41
41

39
39

Answer 1

40

Reason: Use the rule np ≥ 10 and n(1−p) ≥ 10. With p = 0.25, n ≥ 10/0.25 = 40 (and 40·0.75 = 30 ≥ 10).