Types of variables and hypothesis

Question 1

What are extraneous variables (EVs)?

Answer 1

These are variables that might affect the dependent variable if not controlled for

Question 2

What are confounding variables (CVs)?

Answer 2

These are variable that might affect your dependent variable, they vary systematically with the independent variable, so they may not affcet all the P’s equally

Question 3

What are the three parts of a hypothesis?

Answer 3

1. Relationship
2. DV (operationalised
3. 2 levels of IV

Question 4

What are the three types of hypothesis?

Give a basic description of each

Answer 4

• Directional (One-tailed)=States the type of relationship
• Non-directional (Two-tailed)=States there will be a relationship but not which way
• Null=Doesn’t predict a change or difference

Question 5

How do we know when to select a directional or non-directional hypothesis?

Answer 5

• Directional=Based on previous research which suggest a particular relationship
• Non-directional=No previous research or the studies are contradictory

Question 6

When are co-variables used?

Answer 6

Correlational Research