Research Methods Flashcards
Null Hypothesis
Predicts no pattern or trend in results.
Alternative Hypothesis
Predicts a difference or correlation in results.
Independent Variable
Change
Dependent Variable
Measure
Control Variable
Keep
Experimental Designs?
How participants are allocated in experimental conditions.
-repeated measures
-independent measures
Repeated Measures
Testing all participants under both conditions.
Independent Measures
The participants in one condition are independent (different) from participants in the other.
Criticism of Repeated Measures
-May perform better on second condition due to practice effect.
-May perform worse on second condition due to fatigue and boredom.
-Cause demand characteristics.
-Task may need to be changed between conditions making it an extraneous variable.
Criticism of Independent Measures
-Differences in conditions may be due to individual differences
-Potentially more participants will be needed due to them not being able to be used more than once per condition.
Demand Characteristics
Participants changing their behaviour or answers to purposefully hinder or aid an experiment.
Social Desirability
Participants changing their answers because they wished to be liked by the experimenter/person marking a questionnaire.
Samples
Random Sample - a sample selected at chance.
Opportunity Sampling - a sample selected by convenience.
Self-selected Sample - a sample selected through volunteers.
Experiment Types
lab —> lack ecological validity
field (experimenter directly manipulates IV) (natural environment)
natural (IV is NOT directly manipulated e.g piaget )
Extraneous Variable
Any variable that you’re not investigating that affects the dependent variable.
Quantitative Data
Numerical data
Qualitative Data
Descriptive data normally in the form of words, video images or pictures.
Internal Reliability
where a measure is consistent within itself (extraneous variables can affect this)
External Reliability
where a measure is consistent beyond itself, on another occasion