Final answer:
the correct answer is a) Test reliability; test validity.
Step-by-step explanation:
Reliability and validity are two important considerations in data collection. Reliability refers to the ability to consistently produce a given result, while validity refers to the extent to which a measurement accurately measures what it is supposed to measure.
In the context of testing, reliability addresses the question of whether the test is given the same way every time, while validity addresses whether the test is measuring what it is supposed to measure.
For example, if a test is administered in a consistent manner and produces the same scores each time (reliable), but those scores do not reflect the knowledge or skill being assessed (not valid), then the test is not useful for its intended purpose.