1 Science tries to answer questions using logical analysis of evidence. –Evidence can be qualitative or quantitative –The best evidence comes from conducting repeated trials of your work to ensure that your evidence wasn’t a result of a “fluke. Components of Scientific Investigations

2 QualitativeQuantitative Examples Benefits Limitations How would you summarize a comparison of qualitative vs. quantitative evidence?

3 Write a summary that compares qualitative and quantitative evidence: Components of Scientific Investigations

4 Hypothesis is a prediction and it should mention four things: 1.The subject: 2.The independent variable (IV): 3.The dependent variable (DV): 4.In which direction they think the DV will move (higher, lower, faster, slower, more, less…) Components of Scientific Investigations

5 Analyze this hypothesis: When NaN 3 is heated, it will produce more gas than if it were kept cool. Subject = IV = DV = Direction = Would this be qualitative or quantitative? Components of Scientific Investigations

6 Analyze this question: –What will happen to the fizz of a soda if it is left open at room temperature compared to being left open in a cooler? Subject = IV = DV = Would this be qualitative or quantitative? Write a hypothesis based on your analysis: Components of Scientific Investigations

7 When graphing data, in most cases, the IV is placed on the X-axis and the DV is placed on the Y-axis. Components of Scientific Investigations # of bubblesremaining Temperature Warm Cool

8 Can cell phones pop popcorn? Determine your: –IV: –DV: –Confounding variables: Components of Scientific Investigations

9 Can cell phones pop popcorn (continued) –Qualitative or quantitative? –Hypothesis: –Write your procedures on this sheet: Components of Scientific Investigations