In a 2⁴design with factors A, B, C and D, a fraction was generated using the defining relation

I = - ABCD.

a) Which fraction and resolution is this experiment?

Fraction = _________Resolution = ________

b) If the basic design is given by the factors A, B, and C, define the column for D using the minus and plus signs

c) The alias of D is ________________

and the alias of A is ________________

d) If the estimate for A in this fraction is [A]' = 19, what is the alias structure of this estimate

[A]'

e) If an estimate of A from the fraction obtained using the relation I = ABCD is [A] = 24.25, find the estimates of A and its alias.