Psych 421 Psychological Testing and
Assessment Ch 5-6 Question and
answer correctly solved 2025/2026
Reliability refers to... - correct answer ✔consistency in measurement or the proportion of the total
variance attributed to true variance
reliability coefficient - correct answer ✔an index of reliability, a proportion that indicates the ratio
between the true score variance on a test and the total variance
measurement error refers to - correct answer ✔all of the factors associated with the process of
measuring some variable, other than the variable being measured
random error - correct answer ✔a source of error in measuring a targeted variable caused by
unpredictable fluctuations and inconsistencies of other variables in the measurement process
systematic error - correct answer ✔a source of error in measuring a variable that is typically constant
or proportionate to what is presumed to be the true value of the variable being measured
Sources of error variance - correct answer ✔test construction; administration; scoring; interpretation
item sampling or content sampling - correct answer ✔terms that refer to variation among items within
a test as well as to variation among items between tests
test retest reliability - correct answer ✔an estimate of reliability obtained by correlating pairs of scores
from the same people on two different administrations of the same test
, coefficient of stability - correct answer ✔when the interval between testing is greater than six months,
the estimate of test retest reliability
coefficient of equivalence - correct answer ✔the degree of the relationship between various forms of a
test can be evaluated by means of alternate forms or parallel forms coefficient of reliability
parallel forms of a test exist when.. - correct answer ✔for each form of the test, the means and the
variances of observed test scores are equal
parallel forms reliability - correct answer ✔an estimate of the extent to which item sampling and other
errors have affected test scores on versions of the same test when, for each form of the test, the means
and variances of observed test scores are equal
alternate forms - correct answer ✔simply different versions of a test that have been constructed so as
to be parallel
alternate forms reliability - correct answer ✔an estimate of the extent to which these different forms
of the same test have been affected item sampling error or other error
Obtaining estimates of alternative forms reliability and parallel forms reliability is similar in two ways to
obtaining an estimate of test retest reliability: - correct answer ✔1) Two test administrations with the
same group are required
2) test scores may be affected by factors such as motivation, fatigue, or intervening events such as
practice, learning, or therapy
split half reliability - correct answer ✔obtained by correlating two pairs of scores obtained from
equivalent halves of a single test administered; useful when it is impractical or undesirable to assess
reliability with two tests or to administer a test twice
step 1: divide the test into equiv. halves
Assessment Ch 5-6 Question and
answer correctly solved 2025/2026
Reliability refers to... - correct answer ✔consistency in measurement or the proportion of the total
variance attributed to true variance
reliability coefficient - correct answer ✔an index of reliability, a proportion that indicates the ratio
between the true score variance on a test and the total variance
measurement error refers to - correct answer ✔all of the factors associated with the process of
measuring some variable, other than the variable being measured
random error - correct answer ✔a source of error in measuring a targeted variable caused by
unpredictable fluctuations and inconsistencies of other variables in the measurement process
systematic error - correct answer ✔a source of error in measuring a variable that is typically constant
or proportionate to what is presumed to be the true value of the variable being measured
Sources of error variance - correct answer ✔test construction; administration; scoring; interpretation
item sampling or content sampling - correct answer ✔terms that refer to variation among items within
a test as well as to variation among items between tests
test retest reliability - correct answer ✔an estimate of reliability obtained by correlating pairs of scores
from the same people on two different administrations of the same test
, coefficient of stability - correct answer ✔when the interval between testing is greater than six months,
the estimate of test retest reliability
coefficient of equivalence - correct answer ✔the degree of the relationship between various forms of a
test can be evaluated by means of alternate forms or parallel forms coefficient of reliability
parallel forms of a test exist when.. - correct answer ✔for each form of the test, the means and the
variances of observed test scores are equal
parallel forms reliability - correct answer ✔an estimate of the extent to which item sampling and other
errors have affected test scores on versions of the same test when, for each form of the test, the means
and variances of observed test scores are equal
alternate forms - correct answer ✔simply different versions of a test that have been constructed so as
to be parallel
alternate forms reliability - correct answer ✔an estimate of the extent to which these different forms
of the same test have been affected item sampling error or other error
Obtaining estimates of alternative forms reliability and parallel forms reliability is similar in two ways to
obtaining an estimate of test retest reliability: - correct answer ✔1) Two test administrations with the
same group are required
2) test scores may be affected by factors such as motivation, fatigue, or intervening events such as
practice, learning, or therapy
split half reliability - correct answer ✔obtained by correlating two pairs of scores obtained from
equivalent halves of a single test administered; useful when it is impractical or undesirable to assess
reliability with two tests or to administer a test twice
step 1: divide the test into equiv. halves
