validity and reliability in relation to measurement

Question 1

what is validity

Answer 1

accuracy to which the tool measures what it is suppose to

Question 2

what is face validity

Answer 2

instrument looks like its doing its job

Question 3

what is content validity

Answer 3

wether an instrument includes all essential elements it needs to cover

Question 4

a questionnaire is being assessed to make sure it asks all the necessary questions about job satisfaction, which type of validity is this related to

Answer 4

content validity

Question 5

what is the differece between criterion validity and construct validity

Answer 5

criterion: how well a tool predicts a concrete outcome
construct: how well a tool reflects a theoretical concept/construct

Question 6

what is reliability

Answer 6

how consistent and error-free an instrument is

Question 7

what is test-retest reliability

Answer 7

consistency of applying the same test over and over again

Question 8

what is inter-rater reliability

Answer 8

consistency of results in the same test conducted by two different people

Question 9

what is internal consistency

Answer 9

how well items within a test or questionnaire are consistent to one another (all questions align to measure some underlying concept0

Question 10

what are the two main threats to validity in a study

Answer 10

selection bias
measurement bias