बिना किसी हस्तक्षेप के विषयों को उनके प्राकृतिक वातावरण में देखने वाली अनुसंधान विधि को क्या कहा जाता है?

The epistemological view that knowledge is derived primarily from sensory observation and experience is called:

Research that asks a large number of people to respond to questions about their attitudes and behaviour is called a: