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Causal or Association Relationship of Variables
I think that as the pH increases, the number of bubbles given off will decrease.

Causal or Association Relationship of Variables

This Biology quiz is called 'Causal or Association Relationship of Variables' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.

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Variables are necessary parts of any experiment. In this middle school Biology quiz we examine both the association relationship (e.g. tall people tend to be heavier, so height and weight are associated) and the causal relationship (e.g. cold temperatures extend food's shelf life, therefore cold temperatures are a cause of extended shelf life) of variables.

1.
How many different types of variables are there?
One
Two
Three
Four
Dependent, independent and control
2.
Causal implies that...
X caused Y to increase
An unknown factor caused Y to increase
Z was involved
Other factors were involved
When a correlation is spotted, it is then time to see if scientific theory can be used to explain it. If it can't then the correlation may not be causal. Scientists working at the 'cutting edge' of their subject may have to develop new theories to explain the correlation. This is often how new discoveries are made
3.
The key independent variable is...
the factor we change
the factor we keep the same
the factor we measure
the factor we ignore
The key independent variable is the factor we are studying in our investigation and is the basis for our hypothesis
4.
Which is the key independent variable of the hypothesis "I think that as the temperature increases, the rate of bubbles given off will increase due to the increased number of collisions of particles."?
Collisions
Number of bubbles
Rate
Temperature
In this experiment you would be changing the temperature and observing the number of bubbles given off. The variable that you will be changing is the independent variable
5.
Directly proportional means that...
as X increases, Y increases in proportion giving a straight line graph
as X increases, Y decreases
as X increases, Y increases a small amount
As X increases, Y increases greatly
On a scatter graph, if the line of best fit is straight, you have a relationship where the dependent variable is directly proportional to the independent variable. In other words, whenever you double variable X, variable Y will double too
6.
What is an independent variable in a scientific experiment?
A factor which never changes
A factor which changes
A factor whose values are changed or selected by the investigator
A factor which must always be kept the same
It can also be referred to as the key variable
7.
An association is not the same thing as a causal relationship because...
causal means one thing has definitely influenced the outcome
causal means other factors could have caused the outcome
association means they are connected by lots of factors
association is not relevant
Sometimes the correlation is associative because one of the control variables has not been identified and controlled
8.
What is the dependent variable in the prediction "I think that as the pH increases, the number of bubbles given off will decrease."?
pH
Decrease
Increase
Number of bubbles
The dependent variable is the one you measure in the experiment
9.
As X increases, Y increases demonstrates a...
negative correlation
positive correlation
causal relationship
association relationship
We have no way of knowing if X caused Y to increase, but if X increased and Y also increased, there is a positive correlation
10.
The dependent variable is...
the factor we change
the factor we control
the factor we measure
the X factor
It is called this because its values depend on the values chosen for the independent variable
Author:  Donna Maria Davidson

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