CONSTRUCTING A GRAPH
Question and Hypothesis


I wonder what pH is optimal for growing tadpoles
If I change the pH of water, the number of tadpoles
will change
6 steps to making a great graph

What to do….
Identify the Variables
pH of
water
Number of
tadpoles
8.5
45
7.5
69
7.0
78
6.5
88
6.0
43
5.5
23
Independent= __________
Dependent= ___________
Determine the Range
pH of
water
8.5
7.5
7.0
6.5
6.0
5.5
Number of
tadpoles
45
69
78
88
43
23
X axis scale: ___
Y axis scale: ___
1. Find the highest number
𝐻𝑖𝑔ℎ𝑒𝑠𝑡 𝑁𝑢𝑚𝑏𝑒𝑟
2. Equation= 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑠𝑞𝑢𝑎𝑟𝑒 𝑜𝑛 𝑡ℎ𝑒 𝑎𝑥𝑖𝑠
3. You may need to round… Always round UP!
Label the graph
Must have:
• Title
• X Axis
• Y Axis
pH of
water
8.5
7.5
7.0
6.5
6.0
5.5
Number of
tadpoles
45
69
78
88
43
23
Plot the points
pH of
water
8.5
7.5
7.0
6.5
6.0
5.5
Number of
tadpoles
45
69
78
88
43
23
Connect the lines…
Never do a bar graph
pH of
water
8.5
7.5
7.0
6.5
6.0
5.5
Number of
tadpoles
45
69
78
88
43
23
Make a Key
pH of
water
8.5
7.5
7.0
6.5
6.0
5.5
Number of
tadpoles
45
69
78
88
43
23