1. Unit E: Statistics Unit E1: Samples and Populations Digits Topic 14

2. Digits 14.1 Populations and Samples Population Sample the complete set of items being studied A part of the population *Useful when a population is too big to study

3. Digits 14.1 Populations and Samples (continued) Click the mouse to check answers. a.) sample b.) sample c.) population d.) sample

4. Digits 14.1 Populations and Samples (continued) Click mouse to check answer. All are samples except for II PUT ANSWER IN BOOK PAGE 338

5. Digits 14.1 Populations and Samples (continued)

6. Click the mouse to check answers. a.) the population is everyone in the US b.) See next slide

7. Digits 14.1 Populations and Samples (continued) Sample 1: Everyone in Colorado, Iowa, and Kansas? Sample 2: Everyone in Florida, Hawaii, and Maine? Sample 3: 100 people from each state?

8. Digits 14.1 Populations and Samples (continued) Click mouse for answer PUT ANSWER IN BOOK PAGE 338

9. Digits 14.1 Populations and Samples (continued)

11. 1.) 25% of the population are robots. 2.) 20% of the population are robots 3.) 2 out of every 8 members of the population are robots 4.)There are more humans than robots in the population. Invalid Valid Invalid Valid

12. Digits 14.1 Populations and Samples (continued) PUT ANSWER IN BOOK PAGE 339

13. Digits 14.1 Populations and Samples (continued) PUT ANSWER IN BOOK PAGE 339

14. Digits 14.1 Populations and Samples (continued) You will now complete Digits Homework 14.1. You have 15 minutes. Then we will go over it.

15. Sampling Methods (Digits 14.3, 14.4, 14.5) There are four types of sampling methods 1.) Convenience Sampling (Digits 14-3) 2.) Systematic Sampling(Digits 14-4) 3.) Random Sampling (Digits 14-5) 4.) Voluntary Sampling

16. Convenience Sampling (Digits 14.3) Definition: A sampling method in which you choose members of the population that are easily available.

17. Convenience Sampling (Digits 14.3)

18. Systematic Sampling (Digits 14.4) Definition: A sampling method in which you choose every nth member of the population. Which of the following are examples of systematic sampling?

19. Systematic Sampling (Digits 14.4)

20. Simple Random Sampling (Digits 14.5) Definition: A sampling method in which every member of the population has an equal chance of being chosen. Which ones are random sampling?

21. Simple Random Sampling (Digits 14.5)

22. Voluntary Sampling There is no Digits lesson for Voluntary Sampling. What is a “volunteer”? Just like a volunteer is someone who “chooses” to do something because they want to, voluntary sampling happens when people “choose” to do a survey because they want to.

23. Comparing Sampling Methods