Chapter 7 Experiments with One Independent Variable. Determining Variables of Interest. There are many ways to create and manipulate variables The current nature of society often dictates what variables are studied and how they are measured
There are many ways to create and manipulate variables
Example of Study Using Qualitative IV
Question: Do reports of hallucinatory dreams differ in different sleep stages?
Method: Awaken people and get dream reports when
they are in qualitatively
different mental states.
dreams change in
different sleep states.
Example of Study Using Quantitative IV
Question: Do different dosage levels of a drug affect performance of people with ADHD?
Method: Randomly assign participants to conditions and assess
dosages lead to
only up to a point.
Example of a Multiple-Group Design
Question: Do people rate jokes differently if they expect the jokes to be funny or not funny?
Method: Randomly assign participants to groups who expect funny jokes, unfunny jokes, or who have no particular expectations.
rate the jokes
Note: ANOVA can be used with two groups, but typically is not if a study involves only one IV with two groups