6. For the following densities from Appendix A, state whether each represents a location family, scale family, location-scale family, or none of these. For any of the first three situations, suggest a simple noninformative prior for the unknown parameter(s):

(a) X ∼ DE(1, σ2)

(b) X ∼ Unif(θ −

a, θ + a)

(c) X ∼ Logistic(μ, 1)

EXERCISES 99

(d) X ∼ G(α, β), α known

(e) X ∼ G(α, β), β known