Why should HR professionals exercise caution when using correlation in staffing contexts? (Check all that apply.) Multiple select question. The complexity of calculating the correlation can lead to unintentional errors and result in erroneous r values. The formula used to calculate correlation may be based on the false assumption of a linear relationship between two sets of scores. The value of r is often influenced by the amount of variation in each set of scores. The correlation between two variables implies causation between them in most instances