Advantages :
1. The enumerator can personally explain to the respondent the objective of the enquiry and importance of the study.
2. This will help in getting better cooperation of the respondent and in obtaining accurate answers to the questions in the questionnaire.
3. The enumerator can help the respondent in interpreting the questions correctly and recording his answers.
4. This will save time of the respondent and will keep him in good humour.
Disadvantages: The method is expensive. We need a large team of enumerators and spend on their training and travel, besides other expenses on food, stationery, lodging etc.
(ii) Mailing questionnaire to respondents:
Advantage : The method of mailing questionnaries to respondents is far more convenient and less expensive.
Disadvantages : (i) The respondents may not understand or misinterpret some questions.
(ii) The respondent may not take enough care to answer all questions correctly.
(iii) The respondent may ignore and not return the questionnaire at all.
(iv) Some of the questionnaires may be lost in the mail.
1. Preparation of the Questionnaire :
While preparing the questionnaire the
following points should be noted :
(i) The questionnaire should not be very long.
(ii) The questions to be included in the questionnaire must be precise and short.
(iii) The questions should be framed such that they can be cross checked with other questions in the questionnaire.
(iv) The questions should not involve much arithmetical calculations for the enumerator or the respondent.
2. Mode of enquiry : The data may be collected, either by
(i) the interview method, or
(ii) mailing questionnaire.
3. Training of the enumerators: Training programmes for the enumerators have to be arranged, so that they can interpret the questions correctly, explain to the respondents the objectives of the enquiry and importance of the study. They must be trained to be polite in their presentation.
4. Policy survey : In case, it is going to be large scale field study, it is useful to, initially, conduct a survey on a smaller scale (called a pilot survey) before launching the large survey.
According to the census 2001 population of India is 102.70 crore. It was 23.83 crore according to census 1901. In a period of 100 years, the population of our country increased by 78.87 crores. Census 1991 indicated that the annual growth rate of population during 1980s was 2.14 percent which come down to 1.93 percent during 1990s according to census 2001.
Non-random Sampling: In a non-random
sampling method all the units of the population do not have an equal chance of being selected and convenience or judgement of the investigator plays an important role in selection of the sample. They are mainly selected on the basis of judgement purpose, convenience or quota and are non-random samples.