Collection of Data | Chapter 2 | Introduction | Class 11 | ONE SHOT
Rajat Arora・2 minutes read
The chapter discusses the collection, organization, and presentation of data in statistics, emphasizing the importance of primary data collected directly from the source for accuracy and reliability. Different methods of collecting data, such as questionnaires and personal investigations, have their own merits and drawbacks, impacting factors like originality, accuracy, cost, and efficiency.
Insights
- Primary data, collected directly from the source, is deemed more original, accurate, and reliable compared to secondary data, which is obtained from previous collections.
- Secondary data, sourced from publications like government reports and research institutions, includes vital information from sources like the Census of India and NSSO, offering comprehensive data on population, economic activities, and social aspects.
Get key ideas from YouTube videos. It’s free
Recent questions
What is the difference between primary and secondary data?
Primary data is collected directly from the source, while secondary data is obtained from previous collections.
What are the different modes of collecting data?
Direct Personal Investigation and Indirect Oral Investigation are common methods.
What are the drawbacks of the mailing method for data collection?
Lack of interest from recipients, inflexibility in changing responses, and limited use due to requiring educated respondents.
What are some important sources of secondary data?
Government publications, trade associations, research institutions, Census of India, and NSSO.
What are the qualities of a good questionnaire?
Limited number of simple questions in proper order, avoiding undesirable or controversial questions.
Related videos
Summary
00:00
Data Collection Methods in Statistics
- The chapter focuses on the collection, organization, and presentation of data in statistics.
- Data collection involves obtaining information in numerical form for comparison and drawing conclusions.
- Primary and secondary sources of data are discussed, with primary data being collected directly from the source and secondary data obtained from previous collections.
- Primary data is considered more original, accurate, and reliable compared to secondary data.
- Different modes of collecting data are explained, including Direct Personal Investigation and Indirect Oral Investigation.
- Direct Personal Investigation involves collecting data directly from the subject, while Indirect Oral Investigation gathers information from a third party.
- Information through local sources and correspondence involves monitoring individuals through local contacts for continuous data collection.
- Information through Questionnaires and Schedules is a method suitable for educated individuals, where feedback is obtained through structured questions.
- Questionnaires can be mailed or filled in person, allowing for a wide range of data collection.
- Each method of data collection has its merits and demerits, impacting factors like originality, accuracy, cost, and time efficiency.
13:44
Survey Methods: Mailing vs. Inmate vs. Secondary
- Mailing method involves sending a questionnaire with a letter explaining the purpose and requesting completion, ensuring privacy and wide coverage.
- Drawbacks of mailing method include lack of interest from recipients, inflexibility in changing responses, and limited use due to requiring educated respondents.
- Inmate method entails an animator personally visiting respondents to collect data, especially useful in large investigations or language barriers.
- Animators are trained to ask questions intelligently and fill schedules accurately, but the method can be expensive, time-consuming, and biased.
- Good questionnaire qualities include a limited number of simple questions in proper order, avoiding undesirable or controversial questions.
- Secondary data can be collected from published sources like government publications, trade associations, and research institutions, as well as unpublished sources like government data collected for internal use.
- Important sources of secondary data include Census of India and NSSO, providing reliable data on population, economic activities, and various social aspects.
