1. November 15, 2012 (A Day) Agenda • DSJ #13 • Revisit Scientific Method • Hypothesis Worksheet • DSR #13

2. November 16, 2012 (B Day) Agenda • DSJ #13 • Revisit Scientific Method • Hypothesis Worksheet • DSR #13

3. Dsj #13 • Prompt: Suppose you own a dog and a cat. You want to know which one eats more food. List some steps of how you can figure this out. • Do this on page 30B of your notebook.

4. Scientific method Question, Hypothesis, Experiment, Variables

5. question

6. Question • Good scientific questions are ones that can be investigated by making observations and gatheringdata.

7. question • Which one is a scientific question? A: Does my dog eat more food than my cat? B: Which makes a better pet - a cat or a dog?

8. question • Which one is a scientific question? A: Are roses prettier than sunflowers? B: Does temperature affect how often crickets chirp?

9. hypothesis

10. Hypothesis • An answer to a scientific question.

11. Hypothesis • Must be testable

12. Hypothesis • You can gather evidence or data to support or disprove the hypothesis.

13. Is the following a Hypothesis? • Question: Does my dog eat more food than my cat? • Hypothesis: Yes.

14. Is the following a Hypothesis? • Question: Does my dog eat more food than my cat? • Hypothesis: Yes. NO

15. Is the following a Hypothesis? • Question: I left a sandwich on the table, who ate it? • Hypothesis: It is my brother, because he is the only other person home.

16. Is the following a Hypothesis? • Question: I left a sandwich on the table, who ate it? • Hypothesis: It is my brother, because he is the only other person home. YES

17. Is the following a Hypothesis? • Question: Does the number of stars in sky equal the number of grains of sand on earth? • Hypothesis: No, because the number of stars is much more visible than sand.

18. Is the following a Hypothesis? • Question: Does the number of stars in sky equal the number of grains of sand on earth? • Hypothesis: No, because the number of stars is much more visible than sand. NO

19. Is the following a Hypothesis? • Question: If you place a paperclip underwater, will it eventually rust? • Hypothesis: Yes, because water can make certain metals rust.

20. Is the following a Hypothesis? • Question: If you place a paperclip underwater, will it eventually rust? • Hypothesis: Yes, because water can make certain metals rust. YES

21. Hypothesis • You should always do some sort of research (about the question) before you develop ahypothesis.

22. Hypothesis • Should be written in an “If…then…” format

23. Hypothesis • Example: Question – Why is the gecko less active at home than when it was at the pet store?

24. Hypothesis • Example: Question – Why is the gecko less active at home than when it was at the pet store? Possible Hypothesis – Perhaps the gecko is too cold.

25. Hypothesis • Example: Question – Why is the gecko less active at home than when it was at the pet store? Possible Hypothesis – Perhaps the gecko is too cold. Better Hypothesis – If the gecko is moved to a warmer room, then it will behave like it did at the pet store.

26. Hypothesis • Example: Question – Why do crickets chirp more in the summer months?

27. Hypothesis • Example: Question – Why do crickets chirp more in the summer months? Possible Hypothesis – Perhaps crickets chirp more when the temperature is higher.

28. Hypothesis • Example: Question – Why do crickets chirp more in the summer months? Possible Hypothesis – Perhaps crickets chirp more when the temperature is higher. Better Hypothesis – If the temperature increases, then crickets will chirp more frequently.

29. Hypothesis • Let’s practice

30. Hypothesis • Rewrite the hypothesis into an “If…then…” format

31. Hypothesis 1. Question – Will eating chocolate cause a sick stomach? Hypothesis – Yes, especially if too much chocolate is eaten. (Rewrite in an “If…then…” format)

32. Hypothesis 2. Question – How does the amount of light effect plant growth? Hypothesis – Plants will grow faster when there is more light. (Rewrite in an “If…then…” format)

33. variables

34. Crickets

35. Crickets • Observations: • As temperature increases, cricket chirps increase in frequency.

36. Crickets • Observations: • As temperature increases, cricket chirps increase in frequency. • As temperature increases, cricket chirps sound higher.

37. Crickets • Question:

38. Crickets • Question: • Does air temperature affect the chirping of crickets?

39. Crickets • Hypothesis:

40. Crickets • Hypothesis: • If the temperature increases, then crickets will chirp more frequently.

41. Experiment • Actions taken to test the hypothesis.

42. Variables • The factors that can change in an experiment.

43. Variables • Examples:

44. Variables • Examples: • The kind of crickets • Type of container you test them in • Type of thermometer

45. Independent Variable (IV) • The one variable that is purposelychanged in an experiment.

46. Dependent Variable (DV) • The variable that changes as a result of the independent variable.

47. Which variable? Hypothesis: If the temperature increases, the crickets will chirp more frequently. Independent Variable (IV)

48. Which variable? Hypothesis: If the temperature increases, the crickets will chirp more frequently. • Air temperature Independent Variable (IV)

49. Which variable? Hypothesis: If the temperature increases, the crickets will chirp more frequently. • Air temperature Independent Variable (IV) Dependent Variable (DV)

50. Which variable? Hypothesis: If the temperature increases, the crickets will chirp more frequently. • Air temperature • Frequency of cricket chirps Independent Variable (IV) Dependent Variable (DV)