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• 3:2:1• Write down three things you know
about graphing!• Write down 2 things you want to
know about graphing.• Write down 1 question you want me
to answer.
Warm-up
Analyzing Data with a
Graph
Pie Graph• Best for data that
is part of a whole• Good to see
proportion of each part
Pie Graph• Instruction for
drawing– Divide circle into
sections based on the percentage of the whole
Bar Graph• Best for comparing
individual items or events
• Allows you to see how large or small the differences in individual events are
Line Graph
• Best for continuous changes
• Allows you to see the change (ex: in speed, temperature)
Line Graph
• X-axis: independent variable
• y-axis: dependent variable
Line Graph
• Example: Temperature in New York City over a period of six days
Which axis?
• A population of sea monkeys is counted for three weeks.– X-axis = weeks– Y-axis = population of sea monkeys
• Plant height is measured over a period of 8 weeks.– X-axis = weeks– Y-axis = plant height
Which axis?
• The amount of oxygen consumed per minute is measured while exercising.– X-axis = time (minutes)– Y-axis = amount of oxygen
• The amount of food (in grams), eaten by a person each day is monitored. – X-axis = day– Y-axis = amount of food in grams
Creating a Line
Graph
Data
Time (weeks)
Height (cm)
0 4
1 6
2 9
3 12
4 16
5 19
6 21
7 23
8 25
• For eight weeks you monitor the growth of your house plant.
• You record the following information:
Step 1 Title the
Graph
8 Week Observation of House Plant Growth
Step 2 Label Axis with
UNITS
Time (weeks)
Heig
ht
(cm
)
8 Week Observation of House Plant Growth
Step 3 Axis
Scale: Spread It Out
Time (weeks)
Heig
ht
(cm
)
0
126
8642
18
24
8 Week Observation of House Plant Growth
Step 4 Plot
the Data
Points
Time (weeks)
Heig
ht
(cm
)
0
126
8642
18
24
●●
●●
●
●●
●●
8 Week Observation of House Plant Growth
Step 5 Put
in Best Fit
Line
Time (weeks)
Heig
ht
(cm
)
0
126
8642
18
24
●●
●●
●
●●
●●
8 Week Observation of House Plant Growth
NOW YOU HAVE A
GRAPH . . . IT IS TIME TO TRY IT ON
YOUR OWN!!