Psych 301 Lecture 5: Chapter 5 Lecture Notes

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7 Feb 2017
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Chapter 5 Experimental Psychology
2.1.17
Measurement Concepts
Outline:
Reliability of Measures
o True Score & Measurement Error
o Assessment of Reliability
(Assessment of) Construct Validity of Measures
o 6 more types of validity
Reactivity of Measures
Variables and Measurement Scales
o Nominal, Ordinal, Interval, Ratio
Reliability of Correlations
o Reliability of Measures affects maximum correlation
o Restriction of Range attenuation
o Large Gap in Range exaggeration
o Floor & Ceiling Effects attenuation
o Nonlinear Relationship misrepresentation, erroneous
Above picture is a perfect example of reliable and unreliable measures. Sometimes the sad thing
is, that you can get a really quick measure of something like IQ only it’s not reliable, so it’s
not as helpful. You want your findings, your p-value, to be greater than or equal to 0.80.
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