Year 2, Term 4: Data and variables
Scope and sequence: Variables, Fair tests
identify questions of interest and define variables to guide
their investigations and presentations of relevant data.
Australian Curriculum (version 9.0)
"A student gathers and organises data, displays data in lists, tables and picture graphs." (MA1-DATA-01)
"Students learn to acquire data for categorical variables through surveys, observation, experiment and using digital tools; sort data into relevant categories and display data using lists and tables." (AC9M2ST01)
Introduction to the topic
This video (3:41) is a good introduction to the three main types of variables, namely:
Independent variable: The thing you change
Dependent variable: The thing you measure
Control variables: The things that stay the same.
In science experiments, the independent variable
is the thing that you change.
In science experiments, the dependent variable is
the thing that you measure.
In science experiments, the control variables are
the things that remain the same.
Cows Moo Softly
This video (3:45) has a good example of a fair test using
some common kitchen ingredients such as baking soda and three different
types of vinegar.
Correlation across data sets
Sometimes there might seem to be correlations across data
sets which are best described as coincidences such as in the following