Jay_July 31_Understanding Graphs

Jay_July 31_Understanding Graphs

Objectives of Lesson

• Understanding different types of graphs

• Understanding how scaling affects graph appearance

• Given context, select appropriate graph.

Bar Graph

(Definition)

Bar Chart

Suppose I interviewed a group of your friends at school and asked them what their favorite movie was. I recorded the information in the table shown on the right.

Bar Chart

You could display the information in a bar chart

Scaling

Scaling is the process of how you count on the graph. It affects the way your graph looks.

2020 Cowboys Receiving STATS

• Elliot (338 yards)

• Pollard (193 yards)

• Prescott (11 yards)

• Lamb (993 yards)

• Cooper (1114 yards)

• Schultz (615 yards)

• Gallup (843 yards)

Improper Scaling

Poor scaling can mislead observers of the graph. Sometimes groups (especially news), will scale the graph in a way to make you feel a certain away (ELICIT AN EMOTIONAL RESPONSE)

Open Ended

What problems do you see with how I represented the information in the graph?

A better way

Proper scaling helps you tell the truth!!!

Improper scaling deceives people who read your graph!

Adjusting the window

You can also adjust the window minimum and maximum values to view the information in a different way.

Open Ended

Tell me what you notice about this graph ?

Multiple Choice

How many more people said Action than Supernatural as their favourite type of film?

• 2

• 5

• 8

• 10

Multiple Choice

How many more people have purple for a favourite colour than red?

• 3

• 5

• 7

• 9

Multiple Choice

From the bar chart, how many pets do the girls in the class have?

• 19

• 12

• 7

• you can't tell

Multiple Choice

How many more children walk than take a taxi to school?

• 45

• 20

• 25

• 35

Circle Graphs

Circle graphs, sometimes referred to as a pie chart compare categories within relation to a whole.

Circle Graph Exploration

We have ended the talk about bar charts for now. We will now explore circle graphs.

Multiple Choice

The pie chart shows the colours of 32 beads. How many green beads are there?

• 90

• 8

• 11

• 9

Multiple Choice

The pie chart shows the hair colour of a Year 9 class. A student is selected at random. What is the probability that they have brown hair?

• 180%

• 50%

• 25%

• 90%

Multiple Choice

These pie charts show how people travel to work in 2 towns. In which town do more people travel to work by bike?

• town A

• town B

• both the same

• impossible to say

Multiple Choice

This pie chart shows the colour of hats that Tim owns. What fraction of Tim's hats are blue?

• $\frac{1}{4}$

• $25$

• $\frac{1}{3}$

• impossible to say

Multiple Choice

This pie chart shows the colour of hats that Tom owns. Which colour hat does he own the second most of?

• red

• blue

• green

• yellow