Why is it important to know how much variation is in a data set? A. Because large variation in the data suggest bad data. B. Small changes in a dependent variable may not be significant if the variation in the debt is large. Knowing the variation lets you know if there is a true effect of the independent variable on the dependent variable, or if the perceived effect is merely noise in the data. C. The larger, the variation, the stronger the effect. D. The variation in the data are due to noise