premise: How to prevent baking a lumpy cake<br>Place oven rack so cake pan will be baking near the center of your oven so the hot air can circulate fully. Make sure rack is level. Preheat oven.
hypothesis: Baking cakes is easy. 
reason: I'm not sure why it was difficult.  The paragraph doesn't state if baking cakes is easy, so it could be true or not. 