Weeks+8_9_Designing+Research+_+Experiments

Weeks+8_9_Designing+Research+_+Experiments - EXPERIMENTAL...

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9 EXPERIMENTAL DESIGNS, EXPERIMENTAL DESIGNS, RELIABILITY & VALIDITY
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ON THE  MENU  TODAY… C a u sa tio n   o rre la In d e p t,  t a c fo  v ria b le s H w  w  b  th in te rn l a  e x re ssu s o f d g q lity  re se rc h W t so m  o f th jo r th ts to  c
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    First question : Are variables related to each other? UNDERSTANDING RELATIONSHIPS  IN RESEARCH Is TV viewing related to increases in violent behavior? Is participation in sports related to healthier lifestyle choices? Are people more likely to vote for candidates who are of the gender as themselves?
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Correlation does not  imply a direction  for the  relationship Correlation  Correlation  does does  establish:  establish: 1.  1.  That a  That a  relationship relationship  exists  exists 2.  2.  The  The  strength strength  of that relationship  of that relationship
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Negative Negative Correlation Correlation Positive Positive Correlation Correlation
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CORRELATION IS  NOT   CAUSATION! REMEMBER…
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Testing directions of relationships— resulting from strong correlations, and  hypotheses. If I do this, I expect this will happen EXPERIMENTAL METHODS
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Independent (X) Independent (X) Dependent (Y) Dependent (Y) Believed to Believed to influence influence another variable another variable Believed to Believed to be changed be changed by another: i.e., by another: i.e., Y Y depends depends on X on X Manipulated Manipulated by by researcher in Experiment researcher in Experiment Measured Measured by researcher by researcher in Experiment in Experiment
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Variables  not being controlled  by the  researcher—but that also vary  systematically with the DV CONFOUND VARIABLES
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Ex: Study finds that heavy drinkers don’t live  as long as people who abstain or who drink in 
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Weeks+8_9_Designing+Research+_+Experiments - EXPERIMENTAL...

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