Which of the Following Statements Are True?
A) Blocking Is $2 ^r$

Multiple Choice

Which of the following statements are true?

A) Blocking is always effective in reducing variation associated with extraneous sources.
B) It is often not possible to carry out all
Experimental conditions of a
Factorial experiment in a homogeneous experimental environment.
C) When the
Experimental conditions are placed in $2 ^r$
Homogeneous blocks (r<p) , the price paid for this blocking is that $2 ^ { r } - 1$
Of the factor effects cannot be estimated.
D) All of the above statements are true.
E) None of the above statements are true.