Notesale: Turn your study into money

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Chapter 2: COLLECTION OF DATA
Points to remember:
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Collection of data is the first important aspect of statistical survey
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Two sources of data – Primary & Secondary Primary data – data collected by investigator
himself secondary data – data collected by someone and used by the investigator
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Primary data is original data collected by the investigator while secondary data is
already existing and not original
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c]
Primary is costlier or is more expensive whereas secondary data is less expensive
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Indirect Oral Investigation – Data is collected from third parties who have
information about subject of enquiry
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Mailed questionnaire – Data is collected through questionnaire [list of questions]
mailed to the informant
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Telephonic interviews – Data is collected through an interview over the telephone
with the interviewer
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Pilot Survey – Try-out of the questionnaire on a small group to find its short comings
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b]
Minimum number of questions
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d]
Questions should be clear and simple
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Census Method
1) Every unit of population studied
2) Reliable and accurate results

Less Reliable and accurate results

3) Expensive method

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Doubts cannot be cleared regarding
questions

Telephonic Interview Method:
Advantages
1) Relatively low cost

Limited use

Disadvantages

2) Relatively high response rate

Reactions cannot be watched

3) Less influence on informants

Respondents can be influenced

 Census Method – Data collected from each and every unit of population
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 Universe or population in statistics – Total items under study
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Sources of Secondary Data:
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Non-random sampling – It is a sampling method in which all the items do not have an
equal chance of being selected and judgment of the investigator plays an important role
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Non-sampling errors: Errors that accurate the stage of collecting data
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b]
Errors of non-response of some units of the sample selected
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Census of India – It provides complete and continuous demographic record of population
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Sarvekshana – Quarterly journal published by NSSO
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What are the main sources of data?

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Which type of data involves less time and is less expensive?

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Define sampling error
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Name 2 examples of secondary data
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Which method is used for estimation of population?

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3 mark questions:
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4 mark questions:
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3
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Which of the following methods gives better results and why?
a] Census
b] Sample
Write four differences between census and sample methods
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6 mark questions:
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3
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5
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Distinguish between:
a] Primary data and Secondary data
b] Census method and Sample method
Distinguish between primary data and secondary data
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Discuss the method of collecting data through questionnaires filled by enumerators

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