(a) If the generator is BC, what is the implication

(i) We will be unable to study the impact of B or C.

(ii) We will be unable to study the impact of BC.

(iii) We will be unable to study the impact of ABC.

(iv) We will be unable to study the impact of B and C.

(b) What is the meaning "a" in the first column labelled treatment combination?

(i) It means a one unit increase in "a".

(ii) It means only the treatment combination "a" is considered.

(iii) It means "a" is set at high level and other main effects are set at low level.

(iv) It means "a" is set at high level.

(c) What is the meaning "ab" in the first column labelled treatment combination?

(i) It means a one unit increase in "ab".

(ii) It means "a" and "b" are set at high level and other main effects are set at low level.

(iii) It means "ab" is set at high level.

(iv) It means only the treatment combination "ab" is considered.

Plus and Minus Signs for the 23 Factorial Design Factorial Effect Treatment Combination A AC BC ABC ab ac