Chapter 6 - 1.11.3 Chapter 6 – Experimental Research...

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1.11.3 Chapter 6 – Experimental Research Designs Lab Experiments – show us exactly what would happen if we change “one and only one” thing This gives us information on causality between variables We do this by keeping everything constant I) History of True Experiments a. Manipulation – change the levels of a variable (independent variable) to see if it ensues changes in other variables (dependant variables) i. Helps to prove, disprove or find the boundaries conditions for theories ii. Galileo Galilee – first to place great importance on manipulation 1. popularized it by performing some of the first systematic experiments b. Random Assignment i. Must be done because the subjects of the manipulation (people) have to be virtually the same in every experimental group 1. Matching (used long ago) – using two groups of very similar people a. Problems: i. Really hard to do ii. It didn’t really work (people are never the same) iii. Matching people in one dimension (just intelligence) was easy but it is near impossible to do in many dimensions and you’ll never get groups that
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This note was uploaded on 04/17/2008 for the course PSC 3020 taught by Professor Psychmethods during the Winter '04 term at CSU Stanislaus.

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Chapter 6 - 1.11.3 Chapter 6 – Experimental Research...

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