Prove or disprove that the following families of distributions are exponential families.

• TheU(0,)family
• p(x,)={exp[2log+log(2x)]}1[x(0,)]
• p(x,)=91,x{0.1+,,0.9+}
• TheN(,2)family,>0
• p(x,)=2(x+)/(1+2),0<x<1,>0
• p(x,)is the conditional frequency function of a binomial,B(n,),variableX, given thatX>0.