module 6

Question 1

reliability

Answer 1

an indication of the inconsistency or stability of a measuring instrument

Question 2

error in measurement

Answer 2

a measurement is a combination of the true score and an error score

Question 3

true score

Answer 3

score on the measuring instrument if there were no error
observed score=true score+measurement error
reliability=true score/(true score+error score)

Question 4

correlation coefficient

Answer 4

a measure of the degree of relationship between 2 sets of scores
-1.00 to +1.00 (0.00 is no relationship)

Question 5

positive correlation (direct)

Answer 5

an increase in one variable is related to an increase in another (same with decrease)

Question 6

negative correlation (inverse)

Answer 6

an increase in one variable is related to a decrease in the other and vice versa

Question 7

types of reliability

Answer 7

test/retest
alternate-forms
split-half
interrater

Question 8

test/retest reliability

Answer 8

determined by assessing the degree of relationship between scores on the same test administered on 2 different occasions

• assesses stability of a test over time
• practice effects

Question 9

alternate-forms reliability

Answer 9

determined by assessing the degree of a relationship between scores on 2 equivalent tests

Question 10

split-half reliability

Answer 10

determined by correlating scores on one half with scores on other half of a measure
- uses spearman brown and kr20 statistics

Question 11

interrater reliability

Answer 11

assesses the agreement of observations made by 2 or more raters/judges
- needs to be established by percentage of agreement among the raters
interrater=# of agreements/# of possible agreements x100

Question 12

validity

Answer 12

indication of whether the instrument measures what it claims to measure

Question 13

types of validity

Answer 13

content
face
criterion
construct

Question 14

content validity

Answer 14

extent to which a measuring device covers a representative sample of the domain of behaviors to be measured

Question 15

face validity

Answer 15

appears valid on its surface

Question 16

criterion validity

Answer 16

extent to which a measuring instrument accurately predicts behavior or ability in a given area

Question 17

construct validity

Answer 17

degree to which a measuring instrument accurately measures a theoretical construct or trait that is designed to measure

Question 18

relationship between reliability and validity

Answer 18

• a test can be reliable and not valid

- a test cannot be valid and not reliable

Question 19

internal consistency

Answer 19

measure of how well items on a test measure the same construct or idea