11.4 Collecting Data

1. 11.4 Collecting Data

2. Goal Statement • will identify populations and sampling methods

3. Collecting Data • One way to collect data about a group is to conduct a ________________. • The entire group that you want information about is called a ________________. • It is usually difficult to survey every member of a population. Instead, you can survey a __________________, which is part of a population.

4. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

5. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

6. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

7. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

8. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

9. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

10. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

11. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

12. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

13. Sampling Methods Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

14. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

15. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample,random sample, convenience sample, stratified sample

16. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

17. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

18. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

19. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

20. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

21. Sampling Methods Describe the population and the sampling method. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

22. Sampling Methods Describe the population and the sampling method. Give an example of a survey of a population that would use random sampling. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

23. Identifying Potentially Biased Samples • When conducting a survey, you want a sample that is representativeof the population.

24. Identifying Potentially Biased Samples • When conducting a survey, you want a sample that is representativeof the population. A sample that is not representative is a biased sample. • The most reliable way to have a representative, unbiasedsample is to use _____________________. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

25. Identifying Potentially Biased Samples • When conducting a survey, you want a sample that is representativeof the population. A sample that is not representative is a biased sample. • The most reliable way to have a representative, unbiasedsample is to use random sampling. Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

26. Identifying Potentially Biased Samples Why might non-random samples be used when conducting surveys? Self-selected sample, systematic sample, random sample, convenience sample, stratified sample

27. Identifying Potentially Biased Samples

29. Biased Questions Questions that encourage or lead to particular responses are biased questions. When creating a survey, you should phrase questions to avoid bias.

30. Biased Questions Tip: If you can tell what the people are who are asking the question want as an answer, then it is probably biased.

31. Biased Questions “Are you in favor of the plan to plant new shade trees in the downtown area?”

32. Biased Questions “Are you in favor of the plan to plant new shade trees in the downtown area?” b) “Do you support the plan to build a new stadium?”

33. What are some things to consider when conducting a survey?

34. What are some things to consider when conducting a survey? √ whom you want to sample √ how you want to phrase your questions

35. Misleading Graphs and Statistics Graphs and statistics are often used to make advertisements visually appealing. Some ads, however, use graphs and stats to mislead consumers.

36. Identifying Misleading Graphs Explain why the graph is misleading.

37. Identifying Misleading Graphs Explain why the graph is misleading.

38. Identifying Misleading Graphs Explain why the graph is misleading.

39. Identifying Misleading Statistics Explain why the statistics are misleading.

40. Identifying Misleading Statistics Explain why the statistics are misleading.

41. Identifying Misleading Statistics Explain why the statistics are misleading.

42. Explain how a statistic can be accurate but misleading.

44. Copy Vocabulary from Moodle for Dictionary

45. HOMEWORK GREEN CHALLENGE: • p.603 – 605 # 1 – 3all, 5 – 16all • Misleading Graphs WS # 1 – 13all (WS on Moodle) BLUE CHALLENGE: • 11.4 Blue Worksheet • Misleading Graphs WS # 1 – 13all (WS on Moodle)