The chi-square test is an approximate test.The approximation is relatively good if the
A)expected number of cases in each category is 10 or more.
B)expected number of cases in each category is 5 or more.
C)expected number of cases in each category is 3 or more.
D)actual number of cases in each category is 10 or more.
E)actual number of cases in each category is 5 or more.

Question

Quizplus · Accepted Answer

The approximation of the chi-square test is relatively good if the expected number of cases in each category is 5 or more. This is because the chi-square distribution assumes that the expected values are approximately normally distributed, and a rule of thumb is that the normal approximation is good for large enough expected values, which is considered to be at least 5. Therefore, choice B is the best answer.

The Chi-Square Test Is an Approximate Test