Book) IFSTA Fire and Emergency Services Instructor, 8th edition

 

Course) FFP 2741

It is important to understand the differences between reliability and validity. Validity will tell you how good a test is for a particular situation; reliability will tell you how trustworthy a score on that test will be. You cannot draw valid conclusions from a test score unless you are sure that the test is reliable.

8)Explain in detail reasons why tests must be both valid and reliable.

It is important to be concerned with a text`s reliability and validity.
The biggest takeaway when evaluating testing providers is to look for assessments that are both reliable and valid.
The reliability of a certain assessment tool is the extent to which it measures learning consistently.

Validity is harder to assess than reliability, but it is even more important. To obtain useful results, the methods you use to collect your data must be valid: the research must be measuring what it claims to measure. 
 

Step-by-step explanation

It is important to be concerned with a text`s reliability and validity, first reliability provides a measure of the extent to which an examinee`s score reflects random measurement error. In an unreliable test, students` scores consist largely of measurement error.
The biggest takeaway when evaluating testing providers is to look for assessments that are both reliable and valid, because ultimately you want to feel confident that the results are helping you make smarter, data-driven hiring decisions.
The reliability of a certain assessment tool is the extent to which it measures learning consistently. The validity of an assessment tool is the extent to which it measures what it was designed to measure. 

Validity is harder to assess than reliability, but it is even more important. To obtain useful results, the methods you use to collect your data must be valid: the research must be measuring what it claims to measure. This ensures that your discussion of the data and conclusions you draw are also valid.