Find the Reliability and Validity in the article attached.
First let's start with some definitions of the terms you are looking for.
Reliability- refers to the consistency or reproducability of measured results.
Validity- refers to the 'trueness' of the result being measured.
In order for a result to be valid it must also be reliable but just because your results are reliable (ie. the average results are similar) does not make it valid (or ...