A "continuity correction factor" is used to compute probabilities when using the normal distribution to approximate the binomial distribution.

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The continuity correction factor adjusts for the fact that the normal distribution is a continuous distribution, while the binomial distribution is a discrete distribution. This adjustment involves adding or subtracting 0.5 from the observed value or the boundaries of the interval in question when using the normal distribution to approximate the binomial distribution.

A "Continuity Correction Factor" Is Used to Compute Probabilities When