What is important for framing appropriate questions for a questionnaire?

What are secondary data?

Write down the sources of secondary data.

When are secondary sources of data usually used?

What precautions should be taken while using secondary data?

Name any three statistical tools.

What is a questionnaire?

Differentiate between Primary Data and Secondary Data.

Write down the essential qualities of a good questionnaire.

Show the following data with the help of a bar-diagram. Through which media do the people know about the product?

On the basis of the following information find out which types of air-conditioners are preferred by the people. Bases of preference are (i) Brand, (ii) Price, (iii) After sales service, and (iv) Technology.

Table

(in percentage)