Graphing Intro. (in class)
¿Why make a graph?
To show mathematical relationships
To show a picture of data
¿What kinds of graphs can be made?
¿Which kind is best for representing which type of
information?
1. Line
2. Bar
3. Pie (we won’t practice right now)
Directions:
1. Copy the data “Height vs. Weight” onto your own
paper.
2. Hand graph this data A. line of best fit graph
B. bar graph
¿HOW SHOULD WE DO THIS?
¿What are the essential parts of a line graph?
1. Title (e.g. Height vs. Weight) (Independent variable
vs Dependent variable)
2. X axis w/ label (including units)
3. Y axis w/ label (including units)
4. Determine scale (how much does each square
represent?)
5. Insert numbers for each axis
6. Set minimum value on each axis (should we start w/
zero?)
¿How can you tell which value should be the x axis and
which should be the y axis?
X axis is the INDEPENDENT axis
(i.e. its value DOES NOT depend on what the y
value is)
Y axis is the DEPENDENT axis
(i.e. its value DOES depend on what the x value is)
Height is NOT dependent on weight (You can be short,
but weigh a great deal)
Therefore, height is independent, (x axis) & weight is on
the y axis.
Bar graph – student # (x) height & weight (y)