Great question! Stats can either increase or decrease, and there are a few tips to know which ones will change. Usually, at the top of a proposal/resolution there are a few items that are worth noting:
Category: defines which set of stats will be affected. Example: Civil Rights, Education, Culture, Environmental, International Security, etc. If a repeal, the category will also be Repeal.
Some categories have further subcategories (Area of Effect), such as Environmental having an 'Affected Industry' one, which defines, obviously, which industry stat(s) will be affected.
Strength: defines by how much the stats will be affected. There are only 3, namely Mild (small change), Significant (medium) and Strong (big).