2.8 psychometrics

how to make a good IQ test

1. standardized

• pretest (practice): mean, median, mode

• uniformity: same amount of time, same test, same directions

flynn effect

over the years generations get smarter, so tests need to be restandardized throughout the years.

• information, technology, medicine, lifestyle

2. reliability

if its reliable we should get close to the same score every time

• time retest method: same test at a different time period

• split-half method: some take odd and some take even and compare

• alternative/equivalent method: different questions over the same topic

3. validity

accurately measured/ predicted

• content: all areas of subject measured

• construct: measures what is relevant

• criterion-related: results correlate to outside measures

• predictive: predict trends for larger results

• face validity: is seen as valid but really isnt

first IQ tests

Binet Simon- france

Lewis Terman- San Francisco, Stanford Binet IQ test, “g” score (1 result)

Weschler- New York, “g” score, verbal and performance score, WISC (child), WAIS (adult)

types of test

aptitude test: tests your future results (no way to study)

achievement test: measures your past learning