  In this paper we investigate the stellar populations and star formation
histories of 235 active galactic nuclei (AGN)-host dwarf galaxies, consisting
of four samples identified separately with different methods (i.e., radio,
X-ray, mid-IR and variability), utilizing the synthesis code STARLIGHT and
spectra from the Sloan Digital Sky Survey (SDSS) Data Release 8. Our results
show that the variability sample is the oldest, while the mid-IR sample is the
youngest, for which the luminosity at 4020 \AA\ is dominated ($>50\%$) by the
young population ($t<10^8$ yr). The light-weighted mean stellar age of the
whole sample is in general about 0.7 dex younger than the optical sample
studied in Cai et al. We compare the population results between fitting models
with and without a power-law (PL) component and find that the neglect of a PL
component would lead to an under- and over-estimation by 0.2 and 0.1 dex for
the light- and mass-weighted mean stellar age, respectively, for our sample of
dwarf galaxies, which has a mean fractional contribution of $\sim$16\% from the
AGN. In addition, we obtain further evidence for a possible suppression of star
formation in the host galaxy by the central AGN. We also find that there exists
an anti-correlation between the extinction-corrected [O\,{\sc iii}] luminosity
and light-weighted mean stellar age, confirming our previous finding that there
is a physical connection between AGN and star-forming activities in AGN-host
dwarfs.
