Chapter 2 Flashcards
Theory
- Explanation for a set of observations
- Systematic body of ideas about a particular topic
- Predicts future observations
Hypothesis
- Prediction derived from a theory
- Prediction regarding outcome of a study
- Involves at least two variables
Falsifiability criterion
Predictions that can be disconfirmed by data
Can never prove a theory true
but it can be proven false
Theory that cannot be falsified
cannot be considered scientific
Induction
- Specific examples to general statements
- Observation to theory
Deduction
- General statements to specific examples
- Theory to hypothesis
STM capacity as number of items (Miller, 1956)
~7 items in STM
STM capacity as length of time (Baddeley et. al, 1975)
~2 seconds of information in STM
Naturalistic observation (Goal: Description)
Process of observing and describing a phenomenon
Correlation (Goal: Prediction)
Mathematical technique that seeks patterns in data
Experimental method (Goal: Explanation)
Means for systematically testing hypotheses in controlled situations
Model
Simplified version of phenomenon under study (ex. graph, set of equations, computer program)
Model and theory
Good model lends plausibility to theory
Only data can support or falsify a theory
Construct
Label given to set of observations that seem to be related
Memory, attention, intelligence, personality, language
Operational definition
Defines construct in terms of how it is measured
(Intelligence -> score on test)
(Short-term memory capacity-> digit span)
Validity
Degree to which instrument measures what it is clamed to measure
Reliability
Degree to which instrument gives consistent measurements for recurring thing
Experiment
- Tightly controlled situation designed to test a hypothesis
- Comparison between two groups that are treated differently
Bransford and Johnson (1972)
Hypothesis: Context aids ambiguous story comprehension
Method: Group A sees picture, hears story; Group B hears story, no picture
Experimental condition
Group that is given treatment to test hypothesis
Control condition
Group that is not given treatment to provide baseline for comparison
Independent variable
Various types of treatment given to different groups in experiment
Dependent variable
Measurement of response each participant makes to the treatment
Between-subjects design
Assigns each participant to only one condition
Within-subjects design
Assigns each participant to every condition