Discussion:
Q1: Talk about the effect of no smoking laws on the tobacco industry. Will the trend in no smoking laws affect cigarette sales? You can develop a null from that.
Q2: Dunkin' Donuts is trying to infiltrate Starbucks' market by expanding their coffee offerings. Will they be successful? You can develop a null from that.
Q3: Lowe's and Home Depot are competing for the same customers. What different approaches are they taking to gain an edge. There is a business problem here, from which you can develop a null hypothesis.
How do I translate a business problem into a null hypothesis?