.
1
2
3
4
Line graphs only ever have ONE line on them
Line graphs may compare things by having more than one line on them
Line graphs often (but not always) have time along the bottom axis
Line graphs always involve something changing over time
Line graphs MAY include a key (words off to the side that tell us what lines represent)
True
False
6
23
15
We can't tell from this graph
20
What is changing naturally (e.g. time) or changed on purpose by the experimenter
The results
What the investigators measured
The century
4 million
4
5
5 million
We can tell that MCI had 7 million customers in total in 1997
We can tell that MCI now has more customers than AT and T
AT and T and MCI have customers; the number of these customers switching to MCI from AT and T has increased over the period from 1992 to 1997
AT and T and MCI have customers; the number of these customers switching to MCI from AT and T has increased over the period from 1993 to 1996
Y-axis
Z-axis
A-axis
B-axis
Day of the week
Number of food items sold
Time
Number of muffins sold