2. Data Analysis Scientific Method Week 3

3. I Can… I Can #10: analyze data in a table I Can #11: calculate the mean, of data collected in a scientific investigation. I Can #12: create and analyze bar charts.

4. Data Tables ALWAYS organize your data using a data table. Helps you to see the relationship between variables. Amount of Soap Size of Bubble 1 gram1 inch 2 grams3 inches 3 grams4 inches 4 grams6 inches 5 grams8 inches IVDV

5. Paper Towel Data Table Towel #pennies Mass (g) #pennies Mass (g) #pennies Mass (g) #pennies Mass (g) Trial 1Trial 2Trial 3TotalAverage Brawny #1#406#450## # 1135g1163g g g Bounty#240#258## # 783g819gg g Brawny #2#352#107#737# # 153g250g 259 g g Nice n’ Strong#161#669## # 1118 g1150 g g g School#### # g g g g

6. Calculating the Mean To find the mean: 1.Add up all the data to find the TOTAL 2.Then divide this total by the number of values in the data Towel #pennies Mass (g) #pennies Mass (g) #pennies Mass (g) #pennies Mass (g) Trial 1Trial 2Trial 3TotalAverage Brawny #1# 156#210#235# # 256 g300 g326 g g ++=501 ++=882 167 294 /3 /3

7. Bar Graph A bar graph is used to display data in separate categories. It tells you the how many or how much of something that can be grouped under each category. We say it shows frequency. BrawnyBountyBrawnyNiceNSchool 100 200 300 400 500 Paper Towel Strength in Pennies Held Paper Towel Brand Amount of Pennies Held

8. Creating a Bar Graph First a few things to remember… “X to the side, Y to the sky” DRY MIX TAILS

9. Creating a Bar Graph 1.Put the Independent Variable on the x-axis M (Manipulated) I (Independent) X (on X axis) Paper Towel Brand ???

10. Creating a Bar Graph 2.Put the Dependent Variable on the y-axis D (Dependent) R (Responding) Y (on Y axis) Paper Towel Brand Amount of Pennies Held ???

11. Creating a Bar Graph 3.Decide on a scale for each axis (the numbers used on the axes) Scales usually begin with 0. Bar graphs usually don’t have numbers on the x-axis VERY important--the scale you use can change the way your data looks! 100 200 300 400 500 Paper Towel Brand Amount of Pennies Held ???

12. Creating a Bar Graph 4.Select an interval for each scale (the amount of space between data on axes) VERY important-- the interval you use can change the way your data looks! 100 200 300 400 500 Paper Towel Brand Amount of Pennies Held ??? BrawnyBountyBrawnyNiceNSchool

13. Creating a Bar Graph 5.For each condition of the IV draw a solid bar to the height of corresponding DV. BrawnyBountyBrawnyNiceNSchool 100 200 300 400 500 Paper Towel Brand Amount of Pennies Held

14. Creating a Bar Graph 6.Give the graph a descriptive title. 100 200 300 400 500 Paper Towel Strength in Pennies Held Paper Towel Brand Amount of Pennies Held BrawnyBountyBrawnyNiceNSchool

15. Remember TAILS T: Title A: Axis I: Interval L: Labels S: Scale 100 200 300 400 500 Paper Towel Strength in Pennies Held Paper Towel Brand Amount of Pennies Held BrawnyBountyBrawnyNiceNSchoolT A I S L

16. Remember DRY MIX

17. Paper Towel Lab Bar Graph What will be on the x-axis? What will be on the y-axis? How many graphs must you create? What data will you use?

18. Data Analysis Part 2

19. I Can… I Can #13: Represent two numerical variables on a scatter plot. I Can #14: informally describe any apparent relationship that exists between the two variables I Can #15: create and analyze line graphs I Can #16: analyze circle graphs