reliability Flashcards

1
Q

what is classical test theory?

A

a measurement theory that defines the conceptual basis of reliability

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2
Q

what does classical test theory do?

A

specifies procedures for estimating the reliability of scores derived from a psych test or instrument

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3
Q

what is a true score?

A

a hypothetical score devoid of measurement error

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4
Q

what are observed scores?

A

the scores we obtain from tests or instruments

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5
Q

what does reliability reflect?

A

the degree of correspondence between observed and true scores

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6
Q

if there is a discrepancy between true and observed scores, what does this mean?

A

there is measurement error

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7
Q

what are error scores?

A

should have a mean of zero

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8
Q

what is low reliability score?

A

.60

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9
Q

what is the minimum reliability score for beginning stage research?

A

.70

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10
Q

what is a good level of reliability for research?

A

.80

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11
Q

what is the necessary reliability score for applied contexts?

A

.90+

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12
Q

what are parallel tests?

A

two tests are considered parallel if they are identical to eachother psychometrically, but differ in the actual items that make up each test

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13
Q

what is the assumption of tau-equivalence?

A

implies that the true scores associated with each test represent the same construct

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14
Q

what is validity?

A

represents the degree to which the observed scores from a test actually represent the attribute of interest

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15
Q

what does internal consistency reliability involve?

A

treating different parts or items within the same test as different forms of the test

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16
Q

what are the factors that effect internal consistency?

A

the degree of consistency between the parts in the test and the length of the test

17
Q

how does the degree of consistency in the test effect the reliability?

A

the bigger the correlation, the bigger the reliability

18
Q

how does the length of the test affect reliability?

A

the more items, better reliability

19
Q

what does the spearman brown formula involve?

A

making an adjustment to the internal consistency reliability estimate to reflect the actual length of the test

20
Q

what is cronbach’s alpha?

A

represents the ratio of true score variance to total variance