Graphing in Science - Mrs. Shior's Biology Page! · Graphing in Science . Types of Graphs . Bar...
Transcript of Graphing in Science - Mrs. Shior's Biology Page! · Graphing in Science . Types of Graphs . Bar...
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Graphing in Science
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Types of Graphs
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Bar Graph l For comparing data between different groups
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Line Graphs l Good for showing changes over time.
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Can also compare changes over time for multiple groups.
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Scatter Plot used to determine relationships between two different things. The x-axis is used to measure one event (or variable) and the y-axis is used to measure the other.
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Trend Line or Line of Best Fit- A straight line that best represents the data on a scatter plot. This line may pass through some of the points, none of the points, or all of the points.
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If both variables increase at the same time, they have a positive relationship.
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If one variable decreases while the other increases, they have a negative relationship.
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Sometimes the variables don't follow any pattern and have no relationship.
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D-TAILS D-TAILS is an acronym to help you remember everything you need to create a good graph.
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D-TAILS
Data covers the entire graph area and is centered.
YES!!! NO!!!
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D-TAILS
Title Includes what the graph is about and both the independent and dependent variables.
Hours of Sleep vs. Quiz Scores
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D-TAILS Axis Labels Independent variable
is on the x-axis Dependent variable
is on the y-axis
Hours of Sleep vs. Quiz Scores
Sleep
Qui
z Sc
ores
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D-TAILS Interval Marks
Consistent spacing and always start at zero!
Hours of Sleep vs. Quiz Scores
Sleep
Qui
z Sc
ores
0 1 2 3 4 5 6 7 8
100
75
50
25
0
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D-TAILS
Label Units In ( ) after the axis
label, include the proper units
Sleep (hrs)
Qui
z Sc
ores
(%)
0 1 2 3 4 5 6 7 8
100
75
50
25
0
Hours of Sleep vs. Quiz Scores
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D-TAILS Scale use an equal scale
(think count by’s)
Ex: 1,2,3,4 or 2, 4, 6, 8 or 5, 10, 15, 20
NOT
1, 2, 4, 7, 10, 21, 35
Sleep (hrs)
Qui
z Sc
ores
(%)
0 1 2 3 4 5 6 7 8
100
75
50
25
0
Hours of Sleep vs. Quiz Scores
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Usually you will draw a trend line (NOT connect the dots) to show the relationship.
YES! J NO!! L
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Changing the y-axis makes these two graphs seem different, but they show the same data.
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Graphs need to start at zero or they can make changes seem larger than they are.
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Graphs need to have a consistent scale to accurately show information.
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Make a line graph