Which statistical procedure should be conducted if any of the expected frequencies (f_e) are less than 5?

A) Chi-square
B) Fisher's exact test
C) Yates' correction for continuity
D) ANOVA

If any of the expected frequencies is less than 5, Fisher's exact test should be conducted instead of the standard chi-square test. Fisher's exact test is more reliable when dealing with small expected frequencies. Yates' correction for continuity is another method to adjust for the small expected frequencies, but it is not as effective as Fisher's exact test. ANOVA is not appropriate for this situation as it is used to test differences between means of three or more groups.