reliability and validity

Question 1

Term used to imply consistency of a measure

Answer 1

Reliability

Question 2

Term which describes whether a test accurately measures what it is supposed to measure.

Answer 2

validity

Question 3

A measurement can be valid but not reliable, or reliable but not valid TRUE or FALSE?

Answer 3

TRUE

E.g. A pulse oximeter records saturations 5% below the true value every time it is used.
=> ‘reliable’ (the value is consistently 5% below the true value)
BUT not ‘valid’ (as the reported saturations are not an accurate reflection of the true values).