Chapter 12_Experimental Control and Internal Validity

Chapter 12_Experimental Control and Internal Validity -...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Experimental Control and Internal Validity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Threats to the validity of research What is valid research? Conclusions drawn by the researcher are legitimate Threats to the validity Construct validity The measure of the DV does not assess the conceptual dependent variable The manipulation of IV does not create the conceptual variable of interest Statistical validity Incorrect conclusions due to Type I and/or Type II error(s) Internal validity The DV is not caused by the IV, but by other confounding variables External validity The effects are only found under limited conditions and do not generalize
Background image of page 2
Experimental control ….to reduce the threats to internal validity eliminate (control) other effects on the DV other than those of the IV Extraneous variables noise (random error) that increases within group variability and therefore the probability of Type II error non-significant results Confounding variables differ systematically across the experimental conditions
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/26/2011 for the course PSYC 420 taught by Professor Staff during the Fall '08 term at Maryland.

Page1 / 9

Chapter 12_Experimental Control and Internal Validity -...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online