What is meant by primary research?

What is meant by secondary research?

What is 'quantitative' research'?

What is 'qualitative research'?

What is meant by 'validity'?

What is meant by 'reliability'?

Why do we need statistics?

What is meant by 'inference'?

Can we say something about a bigger group of people on the basis of knowledge of a smaller group of people?

Explain sampling.