Graphs – data displays
We will explore 3 types today.
Bar Graphs, Frequency charts,
and Histograms. We will do a quick review of other graphs and their uses.
Higher learning will be done today
Types of graphs and their uses.
percentages
Line Graph Line Graph Change over time
Bar Graph Distinct categories
Groups data into intervals
Displays data from a frequency chart
Example of a circle graph
Example of a Line Graph
Bar Graph - what does a bar graph look like?
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EastWestNorth
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East
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Title
label
Shows distinct categories
But no discrete data
If you need to know details this is NOT the graph to use.
Intervals Tally frequency
0 - 5 |||| 4
6 - 11 || 2
12 - 17 0
18 - 23 ||| 3
Frequency Chart or table
– arranges data in equal intervals or groups. No discrete data is present.
Use the following data to create a frequency chart (or table)
Number of hours students spent watching TV
2 15 4 4 7 20 25 50 14 3 7 5 16 22 23 28
Create intervals
Make sure that you include the smallest number and the largest number.
Each interval must have the same number of entries. What would you suggest?
You have 2 minutes – turn your timers.
1-10 11-20 21-30 31-40 41-50
Would work
Now let’s create our frequency chart. Our data was:
2 15 4 4 7 20 25 50 14 3 7 5 16 22 23 28
1|
0
4||||
4||||
41-50
31-40
21-30
11-20
1-10
frequencyTallyIntervals
7|||| ||
Intervals Tally freq
1-10 |||| || 7
11-20 |||| 4
21-30 |||| 4
31-40 0
41-50 | 1
Now let’s make a histogram using the frequency chart data
TV Watched
students
1-10 11-20 21-30 31-40 41-50
hours
8
7
6
5
4
3
2
1
0
What do you notice?
Your turn now – Use the data below
Use Sage and Scribe structure to create a frequency chart
Change roles then create the histogram
Number of pets owned by students
3 9 19 5 4 0 2 4 2 7 3 0 8 6