representing data eq: how do you determine the best way to represent a set of data?
TRANSCRIPT
Representing Data
EQ: How do you determine the best way to represent a set of
data?
Frequency Tables
• A frequency table shows how often something occurs
• A frequency table shows the category, tally, and frequency of items
• The best time to use a frequency table is to keep track and organize data
Frequency Tables
Trip Location
Tally Frequency
San Diego /// 3
Chicago //// //// / 11
Boston //// // 7
Denver //// 5
Bar Graphs
• A bar graph compares amounts• A bar graph is best used to compare
data• A multiple bar graph also includes a key
Bar Graphs
0
10
20
30
40
50
60
70
80
90
1st Qtr 2nd Qtr 3rd Qtr 4th Qtr
East West North
222324252627282930
6thGrade
7thGrade
8thGrade
Number of Students
Single Bar Graph Multiple Bar Graph
Pictograph
• Uses pictures to represent numbers• Has a key that tells the value of each
picture• The best time to use this graph is to
compare data• It is also very eye-catching and is often
used in newspapers and magazines
Pictograph
Histogram
• A histogram is a special bar graph that shows how ranges of data change or how they differ
• There are no spaces between the bars• A histogram is used to compare data
Histogram
Line Plots
• A line plot is a graph that shows frequency of data along a number line.
• In creating a line plot, you should include your entire range of numbers.
Line Plots
• It is best to use a line plot when you want to quickly analyze your data.
• Line plots allow you to easily identify your outliers- numbers that are significantly smaller or larger than the other values.
Line Plot
Number of Pets in Each Household
The numbers along the x axis represent the number of pets, the x’s represent the households with those number of pets
Line Plot
Line Graph
• A line graph shows how something has changed over time.
• By looking at the line graph you can determine if the data is increasing, decreasing, or staying the same over time.
• Line graphs help predict the outcome of an event.
Parts of a Line Graph
• Title of the graph, • The x and y axes, labels of axes, and the
equal intervals along the axes, • and the representation of the data as
points connected by a line.
Line Graph
Use the data in the table to create a line graph.
Circle Graph
• A circle graph shows the relationship between parts to a whole
• A circle graph is interpreted by comparing the “pieces of the pie” to one another
• Circle graphs are best used when comparing percentages
• The whole circle must total 100%
Circle Graphs
Hair Color of Students
black29%
brown36%
blonde21%
red14%
black
brown
blonde
red