How to set default PyCharm interpreter?

Question

My PyCharm installation has two interpreters available:

• Python 3.3.2 (/usr/bin/python3.3m)
• Python 2.7.5 (/usr/bin/python2.7)

Whenever I

Answer 1

New PyCharm versions in Windows have moved the New Project Settings to a new location. See image.
Full navigation: File > Other Settings > Settings for New Projects > Project Interpreter.