Variables

Controlled Variables Throughout Entire Study:
Same age group of people tested
Same method of measuring results
Paper is the same colour (White)
Consistent level of difficulty for each reading piece
Number of times that the reader gets to see the reading piece
Responding Variable Throughout Entire Study:
Idea memory percentage

Experiment #1 - Effect of the Font Size of a Reading Piece on the Idea
Memory Percentage of a Middle-Aged Reader
Manipulated Variable:
Font size of the reading piece
Controlled Variables:
Font colour of the reading piece
Column width of the reading piece
Type of font (Sans Serif versus Serif) of the reading piece

Experiment #2 - Effect of the Type of Font (Sans Serif Versus Serif) of a
Reading Piece on the Idea Memory Percentage of a Middle-Aged Reader
Manipulated Variable:
Type of font (Sans Serif versus Serif) of the reading piece
Controlled Variables:
Font colour of the reading piece
Column width of the reading piece
Font size of the reading piece

Experiment #3 - Effect of the Font Colour of a Reading Piece on the Idea
Memory Percentage of a Middle-Aged Reader
Manipulated Variable:
Font colour of the reading piece
Controlled Variables:
Font size of the reading piece
Column width of the reading piece
Type of font (Sans Serif versus Serif) of the reading piece

Experiment #4 - Effect of the Column Width of a Reading Piece on the Idea Memory Percentage of a Middle-Aged Reader
Manipulated Variable:
Column width of the reading piece
Controlled Variables:
Font size of the reading piece
Font colour of the reading piece
Type of font (Sans Serif versus Serif) of the reading piece