/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/ is in python-csb 1.2.3+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/__init__.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/ars.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/maxent.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/mixtures.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/pdf/
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/pdf/__init__.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/pdf/parameterized.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/rand.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/samplers/
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/samplers/__init__.py
/usr/lib/python2.7/dist-packages/csb/test/cases/statistics/scalemixture.py