• Independent variable along horizontal (X, or abscissa) axis.

• Dependent variable along vertical (Y, or ordinate) axis.

Line graph.

Bar graph.

Figure 1.2-1 Example graph 1. Car accidents and snowfall p. 14 - 15

# cm of snow	0	7	18	23	25	36	53
# car accidents	4	8	13	15	18	32	45

Study #1 Adaptations of Leaf Size to Precipitation

Study #2 The Effect of Temperature on the Growth of Beans

Study #3 Ecological Study of Creek X p. 18

Note: "Clean" organisms require high levels of dissolved oxygen; "polluted" ones can tolerate low oxygen levels.

Study #4 The Heights of Students in Biology 1100:
Use data from Measurement Lab: section 0 section 1 section 2
Organize heights into 5-cm intervals and calculate:

• mean: divide sum by # of items (average)

• median: middle value

• mode: most frequent value