The population is the entire group being studied.

1. If you had to order t-shirts for your entire school, what sample would you choose to help you predict how many t-shirts of each size to order?

2. In this lesson you will learn how to identify representative samplesby differentiating between biased and unbiased methods of sampling.

3. The population is the entire group being studied. A sample is part of the population being surveyed.

4. How tall are 7th graders? Not all samples will lead to good predictions about an entire population.

5. ? Representative sample accurate prediction based on data Valid inference

6. Sampling method Unbiased Biased

7. This sample comes from a biased sampling method. It is not representative of the population.

8. This sample comes from an unbiased sampling method. It is representative of the population.

9. Another example: Color of leaves in September • 100 fallen leaves collected from the ground • 100 leaves on tree branches c) 50 fallen leaves and 50 leaves on branches d) 50 fallen oak leaves and 50 oak leaves on branches

10. Unbiased sampling method Representative sample Valid inference

11. In this lesson you have learned how to identify representative samplesby differentiating between biased and unbiased methods of sampling.

12. A market researcher wants to know how 18-25 year old women spend their money. Which group would be a representative sample? a) 18-25 year old women at the mall b) 18-25 men and women commuting to work c) Women of all ages commuting to work d) 18-25 year old women commuting to work

13. In a complete paragraph, describe why the following sampling method is biased, and suggest an unbiased method. You want to know your town’s favorite fast-food restaurant. You randomly ask 30 people their preference as they leave one of the fast-food restaurants in town.

14. Choose a population and something you would like to learn about it. Identify examples of biased sampling methods and unbiased sampling methods. • Population: • Desired information: • Examples of biased sampling methods: • Examples of unbiased sampling methods:

15. 1. An ice-cream company wants to find out if its ice cream is the favorite in the state. Which group would be a representative sample? • Customers who visit their store • Employees of ice cream stores in the state • People at the state fair • Adults entering a gym in the capital city

16. 2. Which is an unbiased sampling method for predicting the type of payment most frequently used at a grocery store? Record the type of payment used by… • Students at the local high school • Every 10th customer entering the store c) Every 10th customer in the cash-only line d) Visa card holders

17. Lesson Slides Rubric Use this rubric to ensure your lesson plan is great!

18. Math Rubric

21. Graphic and Image Templates Copy and Paste items from these slides to make your presentation look great!

22. You can copy and paste these items into any slide Green text box that appears letter by letter Green text box that fades in Blue text box that appears letter by letter Blue text box that fades in Red text box that appears letter by letter Red text box that fades in

23. You can copy and paste these items into any slide—make sure you copy both the bubble and the text! Do I feel strongly about it? Do I have a lot to say? Do I have a lot to say? Do I have a lot to say? Do I feel strongly about it?

24. You can copy and paste these items into any slide. You can resize them as needed! Use black text when you write in me please! Also, keep my text left-justified rather than centered! Use black text when you write in me please! Also, keep the text left-justified rather than centered!

25. All arrows can be recolored by changing the “shape fill.” You can also resize them or rotate them!

26. You can use these when discussing main ideas or steps in a process… 1 [Write first step here…] 2 [Write second step here…] 3 [Write third step here…]

27. You can resize any of these boxes and use them to highlight text or ideas.

28. Let’s Review A Common Mistake Core Lesson Guided Practice Extension Activities Quick Quiz