निम्नलिखित में से किस उपकरण में पैमाने पर सूचीबद्ध विशिष्ट व्यवहार को एक संख्यात्मक मान दिया 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: