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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1st Qtr 2nd Qtr 3rd Qtr 4th Qtr

EastWestNorth

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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

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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