In this lesson, students use probabilities to recognize whether events are dependent or independent. In particular, students check that events A and B are independent if either:

• or

Students must pay attention to precision as they use the formulas to decide whether slight differences in probabilities are enough to say that the events are dependent (MP6).

Technology isn't required for this lesson, but there are opportunities for students to choose to use appropriate technology to solve problems. We recommend making technology available.