  We present a detailed analysis of nuclear effects in inclusive electron
scattering from polarized 3He nuclei for polarization asymmetries, structure
functions and their moments, both in the nucleon resonance and deep-inelastic
regions. We compare the results of calculations within the weak binding
approximation at finite Q^2 with the effective polarization ansatz often used
in experimental data analyses, and explore the impact of \Delta\ components in
the nuclear wave function and nucleon off-shell corrections on extractions of
the free neutron structure. Using the same framework we also make predictions
for the Q^2 dependence of quasielastic scattering from polarized 3He, data on
which can be used to constrain the spin-dependent nuclear smearing functions in
3He.
