Graph secrets

Train your crit. C skills
G8 - collapse curriculum

Train yourself:
- Look at many examples
- Reflect on your own practice

​Become a master

Discover the secrets of the criterion C assessment:
- What is expected?
- Formatting and vocabulary.

​Crit. C secrets

Goals

The variables are the key!

Remember or discover

Listen, but more importantly read with great focus the lyrics of the variable song!
Challenge:
Learn and sing the variable song in front of the class during your next science lesson!

Multiple Choice

The variable that is changed on purpose is..

• Control

• Independent Variable

• Dependent Variable

Multiple Choice

The variable that is being tested, counted, or measured and is responding to the independent variable is known as

• Control

• Independent Variable

• Dependent Variable

Multiple Choice

Pick the control (what we can use to compare our results) from the following variables..

vanilla ice cream

vanilla ice cream with sprinkles

vanilla ice cream with hot fudge & caramel

• Vanilla ice cream

• vanilla ice cream with sprinkles

• vanilla ice cream with hot fudge & caramel

• I like it all

Multiple Choice

A student wants to test the hypothesis of "If salt is added to water then the boiling point of water will decrease." What is the independent variable?

• Amount of salt

• Boiling Point

• Amount of water

Multiple Choice

Justin wants to determine the effect of fertilizer on the growth of grass. What is the dependent variable?

• amount of fertilizer

• height of grass

• type of plant

• time

Multiple Choice

Randell wants to determine if salt in the water has an effect on his goldfish. What is the independent variable?

• how much salt is in the water

• temperature

• health of his goldfish

• amount of algae in the tank

Multiple Choice

Zach wants to determine if the amount of time spent on social media has an effect of grades. What is the independent variable?

• popularity

• computer skills

• time on social media

• grades

The table of results

Match

The secrets of the table of results

• The headers

• The boxes / cells in the table

• The unit

• The independent variable

• The dependent variable

describe clearly the variables

contain only numbers

are only shown once in the header

is the one we change

is the one we measure

• describe clearly the variables

• contain only numbers

• are only shown once in the header

• is the one we change

• is the one we measure

​Comments on the video

The units:
- are ONLY shown in the header,
- are in brackets.

The headers:
- are on the first line of the table
- describe specifically and clearly the variables.

The cells / boxes:
- contain ONLY numbers
- the numbers have the same format

The average:
- is shown under the same header as the 3 trials
- In the video, they use test 1, test 2 and test 3... we use trial 1, trial 2, trial 3

​Title

The table of results must ALWAYS have a title.
The secrets of a good title:
- the title is NOT inside the table.
- the title describes clearly and specifically the results that are presented.
- the dependent variable and independent variable must be part of the title.

Labelling

Label the different parts of the table

Drag labels to their correct position on the image

Header

Dependent variable

Independent variable

Cell / box

Unit

Graph

Multiple Choice

What type of graph is commonly used to show the relationship between two variables in science?

• The correct answer is a scatter plot.

• Pie chart

• Bar graph

• Line graph

Main features of a graph

The three next slides will explore the different features of the graph. Take notes!

Specific title: details are given, complete
description of the IV and DV

Y-axis:
Specific
description of
DV with unit in
brackets

X-axis:Specific description of IV with unit in brackets

Evenly distributed
scale, starting at
origin

Scatter plot: DO
NOT JOIN the dots

Patterns in a graph

We are graphing the results of an experiment because it is easier to observe trends and analyse the relationships between the variables.

Trend

Is the DV increasing when IV increases?

Yes-> Positive. No -> Negative

The trend is when you observe the general direction of the graph.

No trend

Sometimes there is no trend.

Relationship

The relationship between your variable is the correlation. You are trying to find a mathematical formula that could connect the IV and DV

In this example, it is a linear relationship because the more I buy chocolate bars the more I will pay in the proportion.

If I buy 2 bars, I pay 4 $
If I buy 4 bars, I pay 8 $

The price increases gradually, the slope of the graph represents the price of 1 bar.

Line of best fit or trend line

When you observe a possible linear relationship, you can insert a line of best fit to your graph.

This will help you comment on how strong the relationship is.

Multiple Choice

On which graph do you see a negative trend?

• A

• B

• C

• D

Multiple Select

On which graph(s) do you see no trend?

• A

• B

• C

• D

Multiple Select

On which graph(s) do you observe a linear relationship?

• A

• B

• C

• D

Multiple Select

On which graph(s) do you observe a non-linear relationship?

• A

• B

• C

• D

Make your analysis deeper

Now you know everything on trend and relationship.
You can make a deeper observation, you want to use adverbs and adjectives to be even more specific in your analysis.

The next slide gives you the last secret!

Look at those examples

​Very strong linear relationship

Or

Strong linear relationship

​Quite strong linear relationship
or
Fairly strong linear relationship
or
Weak linear relationship

Multiple Choice

These graphs show 5 patterns for the daily sales of a new video games as time passed after its release (time,sales).
Which graph shows:  The daily sales declined at a steady rate.

• Graph 1
• Graph 2
• Graph 3
• Graph 4 or 5

Multiple Choice

These graphs show 5 patterns for the daily sales of a new video games as time passed after its release (time,sales).
Which graph shows:  The daily sales did not change.

• Graph 2
• Graph 3
• Graph 4
• Graph 5

Multiple Choice

These graphs show 5 patterns for the daily sales of a new video games as time passed after its release (time,sales).
Which graph shows:  The daily sales rose rapidly, then leveled off, and then declined rapidly.

• Graph 1
• Graph 2 and 3
• Graph 4
• Graph 5

Multiple Choice

Is this popcorn sales data be a linear pattern?

• yes

• no

Outlier:

Data that falls outside of the trend - it is not part of the correlation

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