A designed experiment is a test or series of tests in which ____________ changes are made to the input variables so that we may observe and identify corresponding changes in the output response.

A designed experiment is a test or series of tests in which __________

1.	A designed experiment is a test or series of tests in which ____________ changes are made to the input variables so that we may observe and identify corresponding changes in the output response.
A.	Systematic
B.	Random
C.	Purposeful
D.	Non-purposeful
Answer» D. Non-purposeful