1. Test construction and assessment
intelligence
Test construction and assessment

2. How do we Assess Intelligence?
Alfred Binet and Theodore Simon set out to figure out a concept called a mental age (what a person of a particular age should know).
They discovered that by finding someone’s mental age they can predict future performance.
Hoped they could use test to help children, not label them.

4. Lewis Terman and his IQ Test
Take out a scrap piece of paper.
A 8 year old has a mental age of 10, what is her IQ?
Answer: 125
A 12 year old has the mental age of 9, what is his IQ?
Answer: 75
A boy has the mental age of 10 and an IQ of 200, how old is he?
Answer: 5
Used Binet’s research to construct the modern day IQ test called the Stanford-Binet Test.

5. Repeat after me…
IQ is just a number

6. Problems with the IQ Formula
It does not really work well on adults, why?
If a 60 year old man
does as well as an average 30 year old
then his IQ would be 50!!!!!!
That makes no sense!!!!!

7. Wechsler Intelligence Scales
Wechsler Adult Intelligence Scale (WAIS-III), ages 16 and older
Wechsler Intelligence Scale for Children (WISC-III) for children ages 3-16
both have items that are organized into various subtests.
verbal section
performance section
verbal and performance combined give a single IQ

10. More IQ Tests California Test of Mental Ability
Language and non-language sections
Otis-Lennon Mental Ability Test
Mixes factors together
Emphasizes verbal aspects of intelligence
This is the test used most in Georgia

11. How do we construct Intelligence tests?
Tests must be:
Standardized
Reliable
Valid

12. Modern Tests of Mental Abilities
Aptitude
A test designed to predict a person’s future performance.
The ability for that person to learn.
Achievement
A test designed to assess what a person has learned.

13. Standardization
The test must be pre-tested to a representative sample of people and
Form a normal distribution or bell curve

14. Aptitude and Intelligence Scores

15. Flynn Effect Better nutrition? More education?
More stimulating environments?
Smaller families?
More parent involvement?

16. Reliability
The extent which a test yields consistent results over time.
Spilt halves or test–retest method looks at correlation– the higher the correlation = more reliable test

17. Validity The extent to which a test measures what
it is supposed to measure.
Content Validity : does the test sample a behavior of interest (driving test & driving tasks
Predictive Validity : does the test predict future behavior it was designed to predict? (aka criterion-related validity)

18. Does Intelligence Change Over Time?
By age 3, a child’s IQ can predict adolescent IQ scores.
Depends on the type of intelligence, crystallized or fluid.
Crystallized: one’s accumulated knowledge and skills; tends to increase with age
Fluid: ability to reason speedily and abstractly; tends to decrease with age

19. Intelligence Endures