Constructing Graphs Notes

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 2

How to Make a Circle Graph 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 105 105/300 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 Sci-Fi 75 Sports 60 Biographies 45 Humor 15 TOTAL 300 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) 3

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 4

How to Draw a Circle Graph 5

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) Draw an ‘x’ above each number on the number line to represent each number in your data set 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 4 5 \ 6 7 9 6

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 Above the number line plot the point for each value in #2 Draw a box from the lower to the upper quartile. Inside the box draw a vertical line through the median Draw the “whiskers” from the box to the least and greatest values 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 7

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) List the stems from least to greatest. List the leaves similarly Add key and title for graph States Electoral Votes CA 55 GA 15 IN 11 MI 17 NY \ 31 PA 21 NJ IL KY 8 NC OH 20 TX 34 The table shows the number of Electoral votes for select states in 2004. Make a stem-and-leaf plot. 8