Why is the development of a test that is valid but not reliable ...

[Haya94]

Why is the development of a test that is valid but not reliable impossible?
 
  What will be an ideal response?

Question 2

What is the impact of standardization on reliability?
 
  What will be an ideal response?

[vboyd24]

Answer to Question 1

Reliability is a prerequisite for validity. Thus, a test may be reliable but not valid. However, a test cannot be valid but not reliable.

Answer to Question 2

Standardization tends to increase a test's reliably. The imposition of standardization procedures tends to reduce and eliminate potential sources of error associated with the administration, scoring, and interpretation of a test.

[Haya94]

Thanks for the timely response, appreciate it

[ricroger]

Gracias!