Constructing Graphs Notes

1
Constructing Graphs Notes
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Making Double Bar Graphs

• Steps to constructing graph
• Choose a consistent scale and spacing for the
  y-axis (vertical axis)
• Draw a pair of bars for each group of data and
  label the bars. Use consistent spacing on the
  x-axis (horizontal axis)

• Use different colors or designs for the different
  categories of the bars
• Label the vertical axis and give the graph a
  title
• Make a key to show what each bar represents

The table shows the life expectancies of people
in three Countries. Make a double bar graph of
the data.
Country Male Female
United States 67 74
Mexico 63 66
Canada 65 70
3
How to Make a Circle Graph
Book Type Number of Students Fraction Decimal Percentage Angle Measurement
Mysteries 105
Sci-Fi 75
Sports 60
Biographies 45
Humor 15
TOTAL 300
Book Type Number of Students Fraction Decimal Percentage Angle Measurement
Mysteries 105 105/300
Sci-Fi 75 75/300
Sports 60 60/300
Biographies 45 45/300
Humor 15 15/300
TOTAL 300 300/300
Book Type Number of Students Fraction Decimal Percentage Angle Measurement
Mysteries 105 105/300 .35
Sci-Fi 75 75/300 .25
Sports 60 60/300 .2
Biographies 45 45/300 .15
Humor 15 15/300 .05
TOTAL 300 300/300 1.0
Book Type Number of Students Fraction Decimal Percentage Angle Measurement
Mysteries 105 105/300 .35 35
Sci-Fi 75 75/300 .25 25
Sports 60 60/300 .2 20
Biographies 45 45/300 .15 15
Humor 15 15/300 .05 5
TOTAL 300 300/300 1.0 100
Book Type Number of Students Fraction Decimal Percentage Angle Measurement
Mysteries 105 105/300 .35 35 126
Sci-Fi 75 75/300 .25 25 90
Sports 60 60/300 .2 20 72
Biographies 45 45/300 .15 15 54
Humor 15 15/300 .05 5 18
TOTAL 300 300/300 1.0 100 360
Book Type Number of Students Fraction Decimal Percentage Angle Measurement
Mysteries 105
Sci-Fi 75
Sports 60
Biographies 45
Humor 15
TOTAL

• Find the percent of each book (round to the
  nearest whole)
• Find the angle measurement by multiplying the
  percents by 3.6 (round angles to the nearest
  degree)
• Then use your protractor to draw the central
  angles for each

• Find the total number of students surveyed.
• Compute the fraction for each type of book.
• Change each fraction to a decimal (round to the
  nearest hundredth)

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How to Draw a Circle Graph

• Use your protractor to draw a radius in the
  circle.
• Line the hole on your protractor up with the
  center point of the circle and line your radius
  up with the zero degree mark on your protractor.
• Then, count up from zero to the number of degrees
  you need for your particular angle and mark it.
• Use your protractor as a straight-edge an connect
  the center point to the mark you made.
• Congratulations you just created your first
  angle! Repeat steps 2 4 for the other angles.
• Once all the sections are drawn, label each
  section with the name and percentage and be sure
  to title your graph.
• This video demonstrates how to make a circle
  graph - Watch

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How to Draw a Circle Graph
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Making Line Plots

• Steps to constructing graph
• Order the data from least to greatest
• Construct a number line to include the range of
  values.
• (Be sure your number line has arrows)

1. Draw an x above each number on the number line
   to represent each number in your data set
2. Be sure to title and label your graph

The table shows the number of hours Skipper
spent each day bothering teachers in January.
Make a line plot.
Hour Number of Days
1 3
2 8
3 4
4 5
5 \ 2
6 0
7 0
8 1
9 1
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Making Box-and-Whisker Plots

• Steps to constructing graph
• Order values from least to greatest
• Find least, greatest value, median, upper and
  lower quartiles
• If there are two medians find the average of
  those two numbers

1. Above the number line plot the point for each
   value in 2
2. Draw a box from the lower to the upper quartile.
   Inside the box draw a vertical line through the
   median
3. Draw the whiskers from the box to the least and
   greatest values
4. Label number line and title graph

Construct a Box-and-Whisker Plot of the data
Heights of Basketball players (inches) 73, 67,
75, 81, 67, 75, 85, 69
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Making Stem-and-Leaf Plots

• Steps to constructing graph
• Order the data from least to greatest
• Look at range and determine stems and leafs.
• (Using ten digit for stem and one digit for leafs
  will work for most data)

1. List the stems from least to greatest.
2. List the leaves similarly
3. Add key and title for graph

States Electoral Votes
CA 55
GA 15
IN 11
MI 17
NY \ 31
PA 21
NJ 15
IL 21
KY 8
NC 15
OH 20
TX 34
The table shows the number of Electoral votes
for select states in 2004. Make a stem-and-leaf
plot.