Chapter practice
Sampling and the sample mean
Learning a method? Start with lesson exercises. Ready to apply it? Choose discussion questions. Revising the chapter? Try review practice. Open working when you need it and record your confidence as you go.
Practice collections
Lesson exercises
Start here while learning a method. Use the lesson examples, then try the connected exercises.
Discussion questions
Choose this after the lesson to apply its ideas and explain your reasoning.
Review practice
Choose this when revising the chapter. Try the problems before opening the working to check what you can do independently.
Some questions appear in more than one collection. Your saved confidence follows the question.