Expectation value at ground state

[Roodles01]

I realize that at ground state of a harmonic oscillator the energy will be at zero.
I'm assuming that the expectation value will also be at zero.

Could someone confirm this & possibly explain just a little more.
Thank you

 

[DrClaude]

I realize that at ground state of a harmonic oscillator the energy will be at zero.

It is conventional to set the potential energy at equilibrium to zero, which means that the energy of the ground state is not zero, see http://en.wikipedia.org/wiki/Quantum_harmonic_oscillator

I'm assuming that the expectation value will also be at zero.

Expectation value of what?