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Published byTrever Gridley Modified about 1 year ago

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Graphing 101 – A Review It’s time we got this graphing thing straight!

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Title Should be informative enough to allow graph to “stand alone” “The effect of …(IV)… on …(DV)…” Good: “The effect of fertilizer on the height of pea plants” Bad: “Plant Growth” No periods! This is not a sentence!

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Axes X-axis Horizontal; “across” the bottom Independent variable Ex. Year, day, groups Y-axis Vertical; in the “Y” itself Dependent variable What is being measured/counted

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(Axes, cont.) Consistent intervals Can jump from zero with break, but then must be consistent Appropriate scale? Labels with METRIC UNITS!

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Data Points, Lines, Bars, etc. Accurate Neat

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Legend/Key Is it needed? Clearly labeled Neat

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The Effect of Fertilizer on Plant Height Time (days) Label? (Units?)

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How tall was the 2 g pea plant at 25 days? Interpolating- getting information from a graph from between data points

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The Effect of Fertilizer on Plant Height Time (days) Label? (Units?)

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How tall will the 0 g pea plant be at 45 days? Extrapolating-getting information from my graph from beyond the plotted data points Can only do this if you see a trend.

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The Effect of Fertilizer on Plant Height Time (days) Label? (Units?)

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What kind of graph should you use? Line graphs Continuous data You CAN interpolate and extrapolate! Bar graphs Discontinuous/discrete data Separate groups being compared

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What kind of graph? The Effect of Heat Source over Time on the Temperature of a Rock Line

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The Effect of Heat Source on the Temperature of a Rock Time (minutes) Temperature ( ◦ C)

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What kind of graph? Number of siblings your classmates have Bar

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Title? Number of Siblings Number of Students

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Is this next graph the appropriate type of graph for the data shown? Why? Why not?

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The Effect of Fertilizer on Plant Height Time (days) Height (cm)

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Let’s graph! You will need: Ruler Pencil/Colored Pencils Calculator Some data… p.79

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