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3-22-11 - Btw Ss Design/independent group/randomized...

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3-22-11 Btw Ss Design/independent group/randomized group (ch. 10 & 11) Single Factor (Factor is IV) only 1 IV o Randomized 2 group design o Adv. Simple to carry out Requires few Ss (good for money and time) No pretesting or categorization of Ss (do in matching-Ss design) Stats are relatively simple (t test) o Disadv. Provides limited amount of ino. About nature or function of IV o Presence/absence manipulation most common way to create two groups from one IV Presence of the IV is contrasted with the absence of the IV What is the experimental group? Control group? Experimental group – group that gets the treatment Control group – What is the difference between random assignment and random selecting? Random assignment – we are addressing and making sure we have internal validity by making… Random selection – when we take people from our population and randomly select them for our sample Allows us to look at whether IV has an effect, but nit specific effects
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