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How to draw a graphhttp://maths4biosciences.com
Key points to drawing a graph• Make the best use of the graph paper
• Use a sharp pencil
• Plot your point clearly and add the line
• Join the points, or use a line of best fit
• Clearly label the axes - don’t forget any units
• Give the graph a title
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Don’t forget to give the graph a title
x axis - label it (and don’t forget the units)
y ax
is -
labe
l it (
and
don’
t for
get t
he u
nits
)
Key points to drawing a graph• Make the best use of the graph paper
• Use a sharp pencil
• Plot your point clearly and add the line
• Join the points, or use a line of best fit
• Clearly label the axes - don’t forget any units
• Give the graph a title
Worked example
You have the data shown in the table
How would you plot it on a graph?
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Unknown Absorbance (595 nm)
Conc. (µg/ml)
1 0.500
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Unknown Absorbance (595 nm)
Conc. (µg/ml)
1 0.500
Concentration (µg/ml)
Absorbance (595 nm)
0 0
1 0.054
2 0.130
4 0.225
8 0.410
16 0.844
Unknown Absorbance (595 nm)
Conc. (µg/ml)
1 0.500 9.23
Amount (µgl)
Absorbance (595 nm)
0 0
3 0.066
6 0.130
12 0.255
24 0.481
48 0.966
Unknown Absorbance (595 nm)
Amount(µg)
1 0.187
2 0.406
3 0.703
4 1.189
Concentration (µgl)
Absorbance (595 nm)
0 0
3 0.066
6 0.130
12 0.255
24 0.481
48 0.966
Unknown Absorbance (595 nm)
Amount(µg)
1 0.187 9.0
2 0.406 19.6
3 0.703 33.9
4 1.189 ???
Summary• Make the best use of the graph paper
• Use a sharp pencil
• Plot your point clearly and add the line
• Join the points, or use a line of best fit
• Clearly label the axes - don’t forget any units
• Give the graph a title
• Use different point styles if showing more than one data set
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