The population of all sample proportions has a normal distribution if the sample size (n)is sufficiently large.The rule of thumb for ensuring that n is sufficiently large is:
A)np $\ge$ 5
B)n(1 - p)5
C)np $\le$ 5
D)n(1 - p)$\le$ .5 and np $\le$ 5
E)np .5 and n(1 - p)$\ge$ 5

Question

Quizplus · Accepted Answer

The rule of thumb for the normal approximation to be valid is that both np and n(1-p) should be at least 5.

The Population of All Sample Proportions Has a Normal Distribution ≥\ge≥

The Population of All Sample Proportions Has a Normal Distribution $\ge$