Selecting Quantitative Research designs-2-2

Selecting Quantitative Research designs-2-2 - Classified as...

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Unformatted text preview: Classified as Experimental quasi-experimental non-experimental Within each of the above categories, Studies can vary along several Dimensions structured vs flexible designs between-subjects & within-subjects designs time dimension cross sectional & longitudinal Between subjects/within subjects Retrospective Prospective Differ from nonexperiments in an important aspect: researcher is an active agent rather than passive observer Aim is to understand the nature of relationships among phenomena Best for Cause-Effect Is a certain drug effective in reducing S &S of arthritis in experimental designs, researcher can achieve greater confidence in the genuineness & interpretability of relationships because observed under controlled conditions Manipulation Control Randomization Basic experimental designs after-only design or posttest only design data on IV collected once after the experimental tx has been introduced R X O R O Before-After or Pretest-Posttest Design DV measured at 2 points--before the tx and after the first measurement often called a baseline measure R O 1 X O 2 __________ R O 3 O 4 R=randomization O=observation/measurement X=treatment/intervention Three Group, Before-After Add one more control group that does not get the pretest Test interactive effects of the pretest Solomon Four Group Design R O 1 X O 2 R 3 O 4 R X O 5 R O 6 Randomized Block Design 2 group pretest-post-test design or 2 group post-test only One addition: a blocking variable Blocking variable is variable that, if not controlled, will confound results Participants are assigned to blocks and participants from each block are randomly assigned to either the treatment or control group Attempt to make the two groups equal in terms of the confounding variable Factorial Design Factorial design which there are two or more IVs...
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Selecting Quantitative Research designs-2-2 - Classified as...

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