  An analysis of the currently known exoplanets in the habitable zones (HZs) of
their host stars is of interest in both the wake of the NASA Kepler mission and
with prospects for expanding the known planet population through future ground-
and space-based projects. In this paper we compare the empirical distributions
of the properties of stellar systems with transiting planets to those with
transiting HZ planets. This comparison includes two categories:
confirmed/validated transiting planet systems, and Kepler planet and candidate
planet systems. These two categories allow us to present quantitative analyses
on both a conservative dataset of known planets and a more optimistic and
numerous sample of Kepler candidates. Both are subject to similar instrumental
and detection biases, and vetted against false positive detections. We examine
whether the HZ distributions vary from the overall distributions in the Kepler
sample with respect to planetary radius as well as stellar mass, effective
temperature, and metallicity. We find that while the evidence is strongest in
suggesting a difference between the size distributions of planets in the HZ and
the overall size distribution, none of the statistical results provide strong
empirical evidence for HZ planets or HZ planet-hosting stars to be
significantly different from the full Kepler sample with respect to these
properties.
