Variables/hypotheses

• IV is what the researcher changes in an experiment
• DV is what is measured in an experiment
• Extraneous variables are variables that are not the IV but still affect the DV
• Participants variables -differences between people that may affect the DV
• Situational variables - differences in the environment that may affect the DV
• Experimenter variables - the experimenters conscious or unconscious bias/influence
• A null hypothesis is a prediction that states no relationship between the variables
• An alternate hypothesis states that there is a difference between variables
• Non directional hypothesis [two tailed] states a difference but not what it will be
• Directional hypothesis [one tailed] states a difference and what it will be