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Chapter 2 Lecture 2 How do Psychologists do research (1).pdf

Chapter 2 Lecture 2 How do Psychologists do research...

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Standardization 1 A test is standardized when uniform procedures for giving and scoring test exist. Proper scoring refers to norms or established standards of performance. Norms obtained by mass testing on intended populations to determine different score ranges (e.g., low, average, high)
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Reliability 2 Reliability is the consistency of scores derived from a test from one time and place to the next or across scorers Test-retest reliability Alternate-forms reliability
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Validity 3 Validity is the ability of a test to measure what it was designed to measure. Content validity: measures all facets of a given construct. Criterion validity: do college entrance exams predict college performance?
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Validity vs Reliability 4 IQ IQ IQ IQ IQ
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Surveys 5 Surveys are questionnaires and interviews that ask people about experiences, attitudes, or opinions Allow for extensive data collection but many problems: Obtaining representative sample ( volunteer bias ) Truthfulness of responses Type and phrasing of questions
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Correlational Studies 6 A correlational study is a type of descriptive study that looks for a relationship between two phenomena Correlations: Measure of how strongly two quantifiable characteristics of behaviour (variables) are related to one another
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