CSUF CAS 310 Exam 2 Study Guide || A Verified A+ Pass.
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Course
CSUF CAS 310
Institution
CSUF CAS 310
Reliability correct answers -Consistency AND Stability of test scores
-Stability of measurement, reproducibility over time
-Degree to which test scores are free from error or measurement
-On a continuum from minimal consistency to perfect repeatability,
Most Assessments" is right in the middle...
CSUF CAS 310 Exam 2 Study Guide || A Verified A+ Pass.
Reliability correct answers -Consistency AND Stability of test scores
-Stability of measurement, reproducibility over time
-Degree to which test scores are free from error or measurement
-On a continuum from minimal consistency to perfect repeatability,
Most Assessments" is right in the middle
-Reliability matters, not just a matter of statistics
--Inappropriate and unethical to base important decisions on findings that are not repeatable
--Necessary for validity. A test cannot be valid if it is unreliable
ex. If person takes the same test on two different days, how similar will the scores be?
Why is reliability key to assessment? correct answers -A goal of assessment is often to
understand a person's true knowledge, characteristics, or skills
-Reliability tells us how much variability in test scores is due to ERROR vs TRUE
DIFFERENCE
Measurement Error correct answers -Error is present in ALL measures. We cannot completely
remove all error.
-All measurement includes error and true score
Correlation Coefficient correct answers -Generally based on correlations, which range in value
from -1.0 to 1.0
-A correlation coefficient indicates the level of association between two variables
-Sign of coefficient is positive = both variables go in the same direction
-Sign of the coefficient is negative = both variables go in the opposite direction
-Magnitude or absolute she indicates strength of the relationship
-Closer to 0 is weaker
Classical Test Theory correct answers -The CTT is the most influential theory to help us
understand measurement issues
-CTT holds that even test score has two components
1. True score, the reflects the examinee's true skills, abilities, knowledge
2. Error Score, the reflects random measurement error
True Score correct answers -is unknowable
--a score without error - does not exist
-we can only estimate it
-Test scores that we obtain are called observed scores
-Goal is to reduce ERROR as much as possible
Some tests measure true scores better than others
-The greater the measurement error, the less we are measuring "true" score
, Random Error Score correct answers eflects random measurement error
Types of Measurement Error correct answers Random Error
--Essentially random, nonspecific, "chance"
--Effects are unpredictable, inconsistent
--Not reproducible
Systematic Error
--Non-random, definite cause
--Reproducible
--Many bias results
Sources of Measurement Error correct answers 1. test itself
2. test administration
3. examinee
4. test scoring interpretation
Types of Reliability Coefficients correct answers -RELIABILITY COEFFICIENTS tell us about
the amount of measurement poor associated with test scores
-Reflect the proportion of observed test score variance attribute to true score variance
Improving Reliability correct answers -Increase length of test
-Combine multiple measurements into average or composite score (frequent method used for
standardizing testing)
-Use appropriate content sampling and good test items
-Use precise administration and scoring procedures
-Ensure appropriate test difficulty
Establish reliability with a heterogeneous group
Types of Reliability correct answers There are several types of reliability wth different meaning
and different methods of calculation
-Test retest Reliability
-Internal Consistency
-Alternate Form Reliability
-Interrater Reliability
Test-Retest Reliability correct answers -Measures the consistency or stability of test scores over
two or more administrations to the same individual or group
-Correlate the scores from both administrations
-Primarily reflects temporal stability (accounts for for time sampling error)
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