a study shows that, over the course of a lifetime, the average salary of college graduates is greater than the salary of people with only a high school diploma. The results were published claiming that graduating from college ensures you will make more money of the course of you lifetime. What is the problem with reporting results this way?

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.