PSYC 2130 Lecture Notes - Lecture 8: Confounding, Burglary, Experiment
11 Jan 2014
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Lecture seven (class eight): an independent variable, by definition, must have at least two levels, there are two general possibilities in experimental design, between-subjects design, within-subjects design. Also known as nested design or repeated-measures design: siall and ostrove: attractiveness on jail sentencing, two between subjects: Two crimes: burglary, barbara breaks into neighbours apartment, steals 2000, swindling, barbara meets a stranger in a bar, convinces him to invest in a non-existent company. Two levels of attractiveness: attractive, unattractive. Confounding variable: differences between conditions may be due to individual differences. Also, must have at least 30 people in each group for between subjects. No way to know that the obtained results are due to manipulation or something else: random assignment to remedy this, within subjects: needs fewer subjects which is easier. Sometimes it is the only reasonable choice: pros. Convenient because you need less people: cons:
