When using a normal approximation to find the p-value for testing a proportion, a more accurate p-value is obtained if the z-score is found using a continuity correction. This involves adding or subtracting 0.5 from the observed count before finding the z-score.

The following exercises involve larger sample sizes where an accurate enough p-value can be found using a normal approximation.

In this exercise, you should use a continuity correction when finding the z-score .


Test the value of a population proportion, π

In this exercise, make sure that you understand whether to add or subtract 0.5 from the observed count when finding the p-value.