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UCSD PSYC 151 Test 2 Questions & Answers 2024/2025
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UCSD PSYC 151 Test 2 Questions & Answers 2024/2025 Reliability/Precision - ANSWERS*consistency* -The degree to which a test is free from errors of measurement and/or yields the same result on repeated trials -The statistical evaluation of reliability is the reliability coefficient Cla...

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  • October 22, 2024
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  • 2024/2025
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UCSD PSYC 151 Test 2 Questions &
Answers 2024/2025

Reliability/Precision - ANSWERS*consistency*



-The degree to which a test is free from errors of measurement and/or yields the same result on
repeated trials



-The statistical evaluation of reliability is the reliability coefficient



Classical Test Theory - ANSWERSObserved score (X) = True score (T) + Random Error (E)



True score can never really be known since error is always present



Error can be random

- unpredictable

- lowers reliability of test, but cancels itself out after

repeated (infinite) trials (can also be reduced with

large sample sizes/longer tests)

Error can also be systematic

- source of error always decreases or increases true

score by a set amount

-does not lower reliability of test since the error is

consistent (but still bad)



Reliability Coefficient - ANSWERSRatio of Variances (Classical Theory of Reliability)

the variance of true score/ variance of observed score

, *Represents the percent of observed score variance attributable to true score variance*



An index of the strength of the relationship between two sets of test scores (correlation)



In general should be at least above 0.7 to be considered appropriate, but in many cases a much higher
value is needed (i.e in a medical setting)



Test-retest reliability - ANSWERS-The extent to which an individual obtains a similar score on different
administrations of the test

-The scores from the first and second administration are correlated/compared

- Assumes test takers have not changed, important to administer test to same group (appropriate when
test takers are not permanently changed by taking test)



Alternate-Forms Method - ANSWERS-For various reasons the test developer may create alternate forms
of the same test

-May be used to prevent practice or order effects that might influence test-retest reliability; could also be
alternate forms of a test given to a large group of people to prevent cheating or once again to account
for order/practice effects



Internal Consistency - ANSWERSMeasure of how related items or groups of items are to each other on a
test



Appropriate for homogenous tests (or within homogenous sets of questions); a heterogenous test
measures more than one trait/characteristic



ex./ 5+8 and 7+3 will have high internal consistency

7+4 and 153/76 will not



split-half reliability - ANSWERSTest given in one administration is split in half to measure correlation
between both parts of the test (A measure of internal consistency)



Correlation (r) of both parts of the test

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