9.39 Let Y1 Y2 Yn denote a random sample from Poisson distribution with paramet

9.39 Let Y1 Y2 Yn denote a random sample from Poisson distribution with parameter Lamda. Show by conditioning that the sumYi is sufficient for lamda.9.43 Let Y1 Y2 Yn denote independent and identically distributed random variables from a power family distribution with parameters alpha and theta. Then if alpha theta > 0f(y|alpha theta)= (alpha*y^(alpha 1))/theta^alpha y is on the interval 0 to theta.If theta is unknown show that the product Yi is sufficient for alpha.