PNB 3RM3 Lecture Notes - Lecture 14: Field Experiment, Random Assignment, Internal Validity
6 Oct 2020
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There are 3 main features of an experiment: (1) manipulation of the iv, (2) all other variables are held constant, (3) random assignment to groups, **last one only true for between-subjects. You have to have all three features in order for it to be an experiment* randomness: running an experiment capitalizes on the idea of randomness. We have access to world and want to make conclusions about populations usually when conducting an experiment (population of interest) Before lab: one way of capitalizing randomness: need random selection from a population: allows equal opportunity for people in your population of interest to participate in your study. If you have 2 conditions, and you want 10 people per group then you make sure you have 10 slips of paper for each condition in the hat: called pseu-random because you place a limit on your choices. Some randomization tools: r (and other programming languages, randomizer. org, spreadsheet software.
