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Section 2.4

Section 2.4. Representing Data. Graphing. Visual display of data Picture demonstrating patterns. Circle Graph. Pie chart Good for parts of a fixed whole Percentages. Bar Graph. Shows quantity variations with factors Independent variable  horizontal axis (x)

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Section 2.4

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  1. Section 2.4 Representing Data

  2. Graphing • Visual display of data • Picture demonstrating patterns

  3. Circle Graph • Pie chart • Good for parts of a fixed whole • Percentages

  4. Bar Graph • Shows quantity variations with factors • Independent variable  horizontal axis (x) • Dependent variable  vertical axis (y)

  5. Line Graph • Most graphs in chemistry • Points on line represent intersection of data for two variables • Independent variable  x- axis • Dependent variable  y- axis

  6. Best Fit Line • Best fit line  line drawn so that the same amount of points fall above and below it • Look at the slope of this

  7. Slope • Steepness of a line • Rise over run • Change in y over the change in x y2 - y1=Δy x2 – x1Δx

  8. Interpreting Slopes • Slope rises to the right= positive slope • Dependent variable increases as the independent variable increases

  9. Slope sinks to the right= negative slope • Dependent variable decreases as the independent variable increases

  10. Various Slopes

  11. Interpreting Graphs • Identify independent and dependent variables • Look at measurement units and ranges • Determine linear or nonlinear relationship • Interpret the slope

  12. Continuous Data • Points on line graph are connected • Interpolation: Reading areas between points • Extrapolation: Extend line beyond points

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