Bar Graphs. Bar Graph or Double Bar Graph (REVIEW) A bar graph uses length of bars to represent...

Bar Graphs

MathisFun.Com- Organizing and Comparing Data; Math on Call p. 262-313

Bar Graph or Double Bar Graph (REVIEW)

• A bar graph uses length of bars to represent numbers and COMPARE data.

• In some cases, the use of a pair of bars to compare data is more useful. This kind of graph is called a double bar graph.

How do you make a bar graph?1. Create a title2. Draw an x and y axis (LABEL what each one represents!)3. Plot the information given onto the graph

Example: Last week’s temperatures in degrees Fahrenheit were:Monday- 45 Tuesday- 60 Wednesday- 48 Thursday- 55 Friday- 56 Saturday- 68 Sunday- 70

Let’s make that into a bar graph.

It should look like this:

Monday Tuesday Wednesday Thursday Friday Saturday Sunday0

10

20

30

40

50

60

70

80

Last Week's Temperatures

day of the week

degr

ees

(Fah

renh

eit)

Double Bar Graphs

How do you make a double bar graph?

A double bar graph is used to compare two things at once using the same graph. To create a double bar graph you have to…

1. Create a title2. Draw an x and y axis

(LABEL what each one represents!)

3. Make a key to represent what each of the different bars stand for

4. Plot the information given onto the graph

Last week’s temperatures in degrees Fahrenheit were:

Monday- 45 Tuesday- 60 Wednesday- 48 Thursday- 55 Friday- 56 Saturday- 68 Sunday- 70

Last week’s temperature in degrees Celsius were

Monday- 7Tuesday- 16Wednesday- 9Thursday- 12Friday- 13Saturday- 20Sunday- 21

It should look like this:

Monday

Tuesday

Wednesd

ay

Thursday

Friday

Satu

rday

Sunday

01020304050607080

FahrenheitCelsius

day of the week

tem

pera

ture

(in

degr

ees)

Based on the graph answer these questions:

1. Which day of the week was the hottest in degrees Fahrenheit?2. Which day of the week was the coldest in degrees Celsius?

Histograms

MathisFun.Com- Organizing and Comparing Data; Math on Call p. 262-313

Histogram (REVIEW)• Histograms show how often data falls into

different ranges or intervals.

How do you make a histogram?

Histograms are VERY similar to bar graphs and double bar graphs but:• There are NO gaps between the bars in a histogram.• The x axis is measured in intervals or ranges.

1. Make a title2. Draw an x and y axis (LABEL what

each one represents!)3. Make sure your x axis is in intervals4. Plot the information given onto the

graph

EXAMPLE:You asked customers who bought one of the blue dresses how old they were. The ages were from 5 to 25 years old. You decide to put the results into groups of 5. Then you put the data you collected onto a histogram.

ages

num

ber o

f dre

sses

Blue Dress Poll