Answer:
a.
Independent variable:
i. Fish Extract of Omega 3 Fatty Acids
ii. Placob
Dependent variable:
Memory test
b.
The dependent variable is continuous
c.
The scale of measurement is Ratio scale
And it is a Discrete Variable
d.
Experimental Research Method
Explanation:
a.
There are three variables in the question above.
They are
Fish Extract of Omega 3 Fatty Acids, Placob and Memory test.
The first 2 are the independent variable
They are so because they can't be controlled.
Independent variable also known as controlled variable are those variables that their values do not depend on or affected by the state of any other variable in the experiment.
It is the condition that can be altered in an experiment. It is the variable you control
While the dependent variable are the response or results of an experiment because we are assessing how it responds to a change in the independent variable, so you can think of it as depending on the independent variable.
The independent variable is the Memory test, which proves how much information participants were able to retain from the articles.
b.
The dependent variable, Memory Test is continuous variable.
A variable is said to be a continuous variable if it can take on an uncountable set of values.
Memory test can't be measured in numbers; it can only be evaluated based on reasoning.
c.
The Ratio scale of measurement are used sto represents quantity and has equality of units:
Here, the independent variable are measured in milligrams (500mg, daily).
2 of it is 1000mg; none of it is 0mg which means there's no quantity of the fish extract.
And it is a Discrete Variable because it can take a particular range of Value (i.e. 500mg, daily)
d.
The above research is an experimental research method because it involves the psychologist assigning subjects (the fish extract and platob) to treatments for the purpose of seeing what effect (the memory test) the treatments have on some response.
