Reliability and Validity Worksheet/PSYCH655
Instrument Reliability
Areliable instrument is one that isconsistent in what it measures. If, for example, an individual scores highly on the first administration of a test and if the test is reliable, he or she should score highly on a second administration.
Imagine that you are conducting a study for which you must develop a test in mathematics for 7th-grade students. You develop a 30-point test and distribute it to a class of 12, 7th-grade students. You then administer the test again one month later to the day. The scores of the students on the two administrations of the test are listed below. Use Microsoft® Excel® or IBM® SPSS® to create a scatterplot with the provided scores, formatted as shown in the example graph. What observations can you make about the reliability of this test? Explain.
30-POINT TEST30-POINT TEST
(FIRST ADMINISTRATION)(SECOND ADMINISTRATION)
A1715_______________
B2218_______________
C2521_______________
D1215_______________
E 714_______________
F2827_______________
G2724_______________
H 8 5_______________
I2125_______________
J2421_______________
K2727_______________
L2119_______________
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What XXXX of XXXXXXXX Evidence: XXXXXXX-XXXXXXX, Criterion-Related or XXXXXXXXX-XXXXXXX?
Xvalid instrument XX one that measuresXXXX it XXXX it measures. XXXXXXXX depends on XXX XXXXXX XXX type of evidence there is XX support XXX’s interpretations XXXXXXXXXX XXXX XXXX XXX been collected. XXXX XXXX, you discussed XXXXX kinds of XXXXXXXX that can XX collected regarding XXXXXXXX: XXXXXXX-related, XXXXXXXXX-XXXXXXX, and XXXXXXXXX-XXXXXXX XXXXXXXX.
XXXX XXXXXXXX XXXXX represents XXX XX these three XXXXXXXX XXXXX. In the XXXXX provided, writecontent if XXX question XXXXXX to XXXXXXX-XXXXXXX evidence,criterion if the question XXXXXXX to criterion-related XXXXXXXX, XXXconstruct if XXX question XXXXXX to construct-XXXXXXX XXXXXXXX of validity.
XXX strong XX the relationship between the XXXXXXXX’ XXXXXX obtained XXXXX XXXX instrument XXX XXXXX XXXXXXX’s rating of their XXXXXXX? Citerion
How adequately do XXX XXXXXXXXX in XXX XXXXXXXXXX represent XXXX XXXXX is being measured? XXXXXXX
XX the items XXXX the instrument XXXXXXXX XXXXXXXXX XXXXXXX XXXX XXXXX is being measured? XXXXXXX
Are there a XXXXXXX of XXXXXXXXXtypes XX XXXXXXXX (test XXXXXX, XXXXXXX ratings, XXXXXXXXXXXX, XXX.) that all measure XXXX variable? XXXXXXXX
XXX XXXX do the scores obtained XXXXX XXXX instrument predict XXXXXX XXXXXXXXXXX? Citerion
XX XXX XXXXXX XX XXX instrument appropriate? XXXXXXXXX
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