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ISU PSY 231 - Q&A

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PSY 2311st Edition Lecture 6Outline of Last Lecture I. MeasurementII. 3 Ways to be ObjectiveIII. BehaviorsIV. Physiological MeasurementsV. Interviews and SurveysVI. Quantitative MeasurementVII. SensitivityOutline of Current Lecture II. ErrorsIII. ValidityIV. MeasurementCurrent LectureErrors● Type 1 Error --”false positive”● Type 2 Error --”false negative”Validity● Face Validity --An experiment looks like you would expect it to look like.○ Ex: The stanford prison experiment actually looked like a prison● Predictive Validity --What happens in the experiment can predict something similar in the everyday world. (The experiment does not look like the everyday world)● Predictive and face validity do not have to go hand in hand.● Conceptual Definition --try to capture the general definition of something.● Operational Definition -- visual, concrete, symptoms of this thing you are studying. Whatwould it look like if we saw it?○ must be both observable and countable● Students get tripped on operational and conceptual definitions most on the test.Measurement● Ordinal Scales --rating scale,lacks features of real numbers.○ No true zero○ each number does not represent an exact quantity○ gives you information that is ordered● Ratio Scale --uses actual numbers● Correlational studies are incomplete because they do not prove cause and effect● Reliability --measures the same thing,the same way, every time.○ observable and countable● Validity --Are you watching what you ought to be watching? Is it related to your


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ISU PSY 231 - Q&A

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