When evaluating the effectiveness of treatments, it is important to consider the ratio of explained variance to unexpected variance. This ratio provides insight into how much of the variation in outcomes can be attributed to the treatments versus other factors. In other words, it indicates the extent to which the treatments have a significant impact on the results. Understanding this ratio is crucial in the field of finance, as it allows us to accurately assess the effectiveness of different strategies and investments. So, always keep in mind this crucial ratio when analyzing financial data.