There are many sources of data

Telephone survey is most important when population is spread over a large area.

Data collected by investigator is called secondary data.

There is some bias involved in non random selection of data.

Non Sampling Errors can be minimized by taking large samples.

Frame at least four appropriate multiple choice options for following questions
(i) Which of the following is most important when you buy a new dress?
(ii) How often do you use computers?
(iii) Which of the Newspapers do you read regularly?
(iv) Rise in Price of petrol is justified (v) What is the monthly income of your family?

You want to research on popularity of vegetable Atta noodles among children. Design a questionnaire for collecting this information.

In a village of 200 farms, a study was conducted to find the cropping pattern. Out of 50 farms surveyed, 50% grew only wheat. Identify the population and sample.

Give two examples each of sample, population and variable.

Do samples provide better results than surveys? Give reasons for your answer.