Suppose s random sample of 20 observations is taken from an infinite population. The sampling distribution of p̂ is
a. not normal since n < 30
b. approximately uniform because p is always normally distributed
c. approximately normal if np > 30 and n(1 - p) > 30
d. approximately normal if np ≤ 5 and n(1 - p)≤ 5
Answer: d. approximately normal if np ≤ 5 and n(1 - p)≤ 5
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