Let Y1, Y2, Y3, and Y4 constitute a random sample of size n = 4 from a Bernoulli population with parameter p. (a) Determine whether Y = 2Y1 +Y2 +Y3 +Y4 is sufficient for p. (b) Determine whether Y = Y1 +Y2 +Y3 +Y4 is sufficient for p. If it is, find an MVUE for p.