Chapter 5 - What is Test Reliability/Precision? Flashcards
What does the Classical Test Theory explain?
explains why observed test scores can fluctuate even when a person’s true level of an attribute remains unchanged, attributing the differences to measurement errors and random factors
According to CTT a person’s observed score made up of?
True score (a measure of the amount of the attribute that the test is designed to measure) and Random error
what is reliability coefficient?
the correlation between the two sets of test scores, expressed as rxx
The reliability coefficient for the individual’s score on the test was: rxx = .72. What does this mean?
: It means that 72% of the variance in the observed score on the test can be accounted for by the participant’s true score. The remaining 28% of the variance in the observed score is accounted for by measurement error.
What is Internal Consistency Method?
a measure of how related the items on a test are to each other
What is One method to measure internal consistency?
the split-half method
What is the spilt half method?
the test is divided into two halves, and scores from each half are compared ➔ halves should be equal in length and content
