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Chapter 8 Logic of Experimental Design

# Chapter 8 Logic of Experimental Design - 12:38:00 I...

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Chapter 8 Logic of Experimental Design28/04/2009 12:38:00 I. Types of Research Designs (revisited) a. Descriptive research b. Correlation search  c. Experimental research  i. Tells us how things are related to each other AND how they got to be  that way ii. Focus is on establishing causality iii. Also know as: randomized experiment, randomized trail, true  experiment  II. Causality  a. X causes Y is it is [possible to change U by changing X b. 3 conditions need to be met to infer causality i. Conversations between X and Y 1. Some type of relationship between the two ii. Temporal precedence of X before Y 1. Cause (X) need to change before result (Y) changes  iii. No Third Variables 1. That one Variable that may cause x and y to change  a. Has to change both x and y  III. Headlines: Correlation or Causality? a. “Facebook users get worse grades in College” i. Facebook causes bad grades in college  b. “Church attendance boosts immunity” i. Church attendance causes a boost in immunity  c. “Child anxiety linked to drug use” i. Child anxiety correlated to drug use  d.

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Chapter 8 Logic of Experimental Design - 12:38:00 I...

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