To use the normal approximation, it is required that either NP ?5= 10 or NQ ?5= 10, but not both.

Name: To use the normal approximation, it is required that either NP ?5= 10 or NQ ?5= 10, but not both.
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The normal approximation to the binomial distribution requires that both $NP \geq 10$ and $NQ \geq 10$, where $N$ is the number of trials, $P$ is the probability of success, and $Q = 1 - P$ is the probability of failure.

To Use the Normal Approximation, It Is Required That Either