Which of the Following Statements Are True?
A) for Experimental $2 ^ { 6 }$

Multiple Choice

Which of the following statements are true?

A) For experimental situations with more than three factors, there are often no replications, so sums of squares associated with nonconfounded higher-order interactions are usually pooled to obtain an error sum of squares that can be used in the denominators of the various F statistics.
B) One replicate of a $2 ^ { 6 }$
Factorial experiment involves an observation for each of the 64 different experimental conditions.
C) If an experimenter decides to include only
Of the
Possible conditions in the experiment; this is usually called a half-replicate.
D) The first step in selecting half-replicate is to select a defining effect as the nonestimable effect.
E) All of the above statements are true.