Lecture 3. Sept. 24

Lecture 3 Sept 24 - Introduction to Psychology PSYC 1001 Section E Wednesday Sept 24 2008 Last lecture before Midterm#1 Todays class Experimental

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Introduction to Psychology PSYC 1001, Section E Wednesday, Sept. 24, 2008 Last lecture before Midterm #1
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Today’s class Experimental research Crest example Descriptive Statistics Inferential Statistics Research Flaws Descriptive/Correlational research The correlation coefficient
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• You have been named research director for Crest toothpaste & have been asked to devise an experiment comparing Crest to Brand X • What variables should/will you use? • How would you operationally define & manipulate the variables? • What variables need to be controlled so that they do not affect the outcome of the study? IV: Control Group: Exp. Group: DV: Extraneous variables:
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Our Crest Experiment Is Crest better than Brand X ? Hypothesis: Crest users will have better dental hygiene than Brand X users Independent Variable (IV): Toothpaste brand Operations: Use 2 ml of toothpaste 2X (2 min. each session) per day, for 6 months Control group: Receive Brand X treatment Experimental group: Receive Crest treatment Dependent Variable (DV): Dental hygiene Operational defn : # of cavities upon dental exam
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The Crest Experiment Extraneous Variables: Time spent brushing teeth, Number of brushings/day; Diet, Toothbrush brand, Personal dental history etc… Research Method: Experiment We can manipulate the IV in an attempt to isolate its effect on the DV (# of cavities after 6 months usage) Collect the Data: Technique: Dental examination
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The Crest Experiment: Raw data ID # Group (Control = Brand X) # of Cavities ID # Group (Experimental = Crest) # of Cavities 1 Control 2 12 Experimental 0 2 Control 3 13 Experimental 1 3 Control 4 14 Experimental 2 4 Control 4 15 Experimental 2 5 Control 5 16 Experimental 3 6 Control 5 17 Experimental 3 7 Control 5 18 Experimental 3 8 Control 6 19 Experimental 4 9 Control 6 20 Experimental 4 10 Control 7 21 Experimental 5 11 Control 8 22 Experimental 6
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Measures of Central Tendency ID # Group (Control = Brand X) # of Cavities 1 Control
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This note was uploaded on 04/04/2010 for the course 32611 PSYC 1001 taught by Professor Darcylitteljohn during the Fall '08 term at Carleton CA.

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Lecture 3 Sept 24 - Introduction to Psychology PSYC 1001 Section E Wednesday Sept 24 2008 Last lecture before Midterm#1 Todays class Experimental

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