Warm up Find the mean, median and mode: Create an example of a biased survey question and a non...

Warm up Find the mean, median and mode:

Create an example of a biased survey question and a non biased survey question.

8 5 7 6 8 2

6 86.5

Bar Graphs and Histograms

Bar Graph

Double Bar Graph

Histogram

Bar Graphs

A visual representation of data Require labels on the horizontal and

vertical axis Values go on vertical axis Use the range of values to determine

scale Items go on horizontal axis

Example

In the 1990’s, four space shuttles were used for various missions. The number of missions taken by each shuttle during this time are shown in the table. Create a Bar Graph to show your data.

Shuttle Missions

Atlantis 16

Columbia 18

Discovery 17

Endeavour 13

What shouldMy scale be?

Shuttle Missions

Atlantis 16

Columbia 18

Discovery 17

Endeavour 13

0

2

4

6

8

10

12

14

16

18

20

Atlantis Discovery

Missions

Shuttle

Missions

Using the chart How could we findThe mean number of Books read over the summer?

9 5 7 10 6 37

377.4

5

Double Bar Graph

Same as a single, except it compares two items.

Requires a key

This is a table showing the number of students who play a sport.

Sport Boys Girls

Soccer 10 9

Basketball 15 12

Track and field 8 10

Volleyball 5 16

What goes on the horizontal axis?

What goes on the vertical axis?

Create a rough sketch of this data in a double bar graph

Sport Boys Girls

Soccer 10 9

Basketball 15 12

Track and field

8 10

Volleyball 5 16

02

4

6

8

10

12

14

16

Soccer Basketball Track Volleyball

Sports Students Like

Boys

Girls

Sport

# of students

Histogram

Different than bar graphs Used to show change in intervals

(1-5, 6-10, 11-15) Interval goes on the horizontal axis Must use equal intervals

Frequency Table

To help organize data and determine interval Look at data and choose intervals of equal

size that will cover all of the data. (look for the largest and smallest value and

make an educated judgement) Count the amount of numbers that fall into the

interval. That is your frequency.

Constructing a Frequency TableThe number of named stars in a group of 34 constellations are listed below. Make a frequency table of the data.

7, 5, 4, 10, 5, 7, 2, 6, 8, 1, 5, 1, 3, 1, 12, 11, 2, 11, 2, 5, 0, 6, 14, 8, 3, 1, 15, 10, 0, 2, 1, 15, 9, 1

What is the smallest and what is the largest number?

0 15The interval must be equal, what should use?

Interval Tally Frequency

0-3

7, 5, 4, 10, 5, 7, 2, 6, 8, 1, 5, 1, 3, 1, 12, 11, 2, 11, 2, 5, 0, 6, 14, 8, 3, 1, 15, 10, 0, 2, 1, 15, 9, 1


0-3

4-7

8-11

12-15

7, 5, 4, 10, 5, 7, 2, 6, 8, 1, 5, 1, 3, 1, 12, 11, 2, 11, 2, 5, 0, 6, 14, 8, 3, 1, 15, 10, 0, 2, 1, 15, 9, 1


0-3 14

4-7 9

8-11 7

12-15 4

7, 5, 4, 10, 5, 7, 2, 6, 8, 1, 5, 1, 3, 1, 12, 11, 2, 11, 2, 5, 0, 6, 14, 8, 3, 1, 15, 10, 0, 2, 1, 15, 9, 1

0

5

10

15

0-3 4-7 8-11 12-15

Number of Stars

Fre

quen

cy

Number of Stars in 34 Constellations

When do you use

A bar graph?

A double bar graph?

A histogram?

Closure

Using your data from the pizza survey create a bar graph, a double bar graph, and a histogram.

You may work with your partner but must create your own graphs with your own data.

Remember to use labels and keys

Bar Graph

0

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16

18

Atlantis Columbia Discovery Endeavor

Missions

Double Bar Graph

0

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6

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10

12

14

16


Boys

Girls

Sport

# of students