1. Find the independent and dependent variables in the following examples: People´s attitudes can be changed by propaganda
Independent variable:
Dependent variable:

A:Workers will produce less if the work environment is noisy
Independent variable:
Dependent variable:

B:Training hard will make you a faster runner
Independent variable:
Dependent variable:

C: Certain vitamins could extend a person’s life-expectancy
Independent variable:
Dependent variable:

D: If you take a math test in the morning you will do better than if you take it in the evening
Independent variable:
Dependent variable:

E: Human attention varies at different times of the day
Independent variable:
Dependent variable:

F: Smiles tend to bring a smile to those who are smiled at
Independent variable:
Dependent variable: