I say teach them the business. Statistics is a fine tool, but you need to know what you are doing. You can build a regression line to predict sales in a given m

I say teach them the business. Statistics is a fine tool, but you need to know what you are doing. You can build a regression line to predict sales in a given month, but you migh forget important drivers or to just ask people with experience. On top of that, remember that looking at the past to predict the future does not always work. First, because you might not have a past (if you are a start up...); second, because new tech and facts might screw up your regression analysis very easily, especially in a fast moving sector (and if you are a start up...). Said that, I find simple descriptive statistics very useful, I wish people in business knew at least what a variance is.