Week four - WAIS IV - Core subsets Flashcards
How is confidence interval for psychological test scores calculated?
You use the Standard Error of Measurement to calculate a confidence interval.
SEM is the standard deviation of error of a test score from a given measurement.
If we wanted to calculate a 95% confidence interval then we would calculate that has test score +/- 2SEM (2 sds).
SEM is calculated by using the standard deviation of the test and the reliability coeffiicient of the test.
E.g. if someone got an IQ score of 100 using a WAIS-IV then the 95% confidence interval would be calculated as follows:
sd of WAIS-IV is 15
Reliability coefficient is .96.
SEM = sdxsqrt(1-reliability coef.)
SEM= 15xsqrt(1-.96)
SEM=3
so 95% confidence interval = 2SEM +/1 100 = 94 - 106.
This essentially means that the clients TRUE score is likely to fall within that range 95% of the time.
What are some factors that may influence test scores?
Testing situation, such as noise, environment that triggers or activates the client, time of day, lighting, temperature etc.
Tester characteristics, such as halo effect, rapport, cultural understanding, expectations.
Test-taker characteristics, such as anxiety, illness, lack of sleep, too much sleep, hunger or thirst levels etc.
Validity errors, such as normative reference group - who was the test designed on/for? Language and culture can also influence how valid test scores are.
What does Classical Test Theory say?
It says that people have a true score and whenever a test is used there will measurement error. Therefore test scores are the person’s true score and error.
What does the block design subset in the WAIS-IV test?
Are the block design tasks timed?
yes.
What do the similarities task in the WAIS-IV measure?
What does DIGIT SPAN measure in the WAIS-IV?
Specifically, what does digit span forward and digit span backward measure? If there is a difference in these scores, what does that tell us?
Digit span forwards measures short-term auditory memory, whereas digit span backwards measures a client’s ability to manipulate verbal stimuli that is being held in temporary storage.
What does matrix reasoning measure in WAIS-IV?
What is fluid intelligence?
Fluid intelligence can be a good indicator of overall intelligence level.
What does the arithmetic section of the WAIS measure?
What does SYMBOL search measure in the WAIS?
It measures the speed of processing.
What does the INFORMATION section of the WAIS measure?
This seems like it would be the most affected by culture? Maybe?
What does CODING section measure in the WAIS?
What are the subscales of the WAIS?
