CBSE Class 11 Statistics Important Questions
Question 1 ( Chapter 2 Collection of Data )
Define primary data.
Answer: Primary data is the collection of data collected by the investigator for his purpose for the first time. These are collected from the source of origin.
Question 2 ( Chapter 2 Collection of Data )
Define secondary data.
Answer: According to Wessel, “Data collected by other persons is known as secondary data”. It is known as secondary data as it has already been collected by somebody else. These data are accessible in the form of a published and unpublished report.
Question 3 ( Chapter 2 Collection of Data )
What are the two sources of data?
Answer: The two sources of data are.
- Primary source
- Secondary source
Question 4 ( Chapter 2 Collection of Data )
Mention two sources of secondary data.
Answer: The two sources of secondary data are.
- Government publication
- Semi-government publication
Question 5 ( Chapter 2 Collection of Data )
In what parameter is statistical information published in the census of India.
Answer: The parameter is statistical information published in the census of India are.
- Population projection
- Sex composition of a population
- Density of population
- Size, growth rate, and distribution of people in India
Question 6 ( Chapter 2 Collection of Data )
Mention two demerits of Indirect oral investigation.
Answer: The two demerits of Indirect oral investigation are.
- Less Accurate
- Doubtful Conclusion
Question 7 ( Chapter 2 Collection of Data )
The progress report of a railway published by the railway department is what kind of data?
Answer: The progress report of a railway published by the railway department is secondary data.
Question 8 ( Chapter 2 Collection of Data )
When is a direct personal investigation suitable for primary data collection?
Answer: The direct personal investigation method is suitable for collecting primary data only on the situation when
- The investigation is confined and less
- Authentic and accurate information is required
- The data is to be kept secret
- Direct contact with information is needed
Question 9 ( Chapter 2 Collection of Data )
When are the qualities of a good questionnaire?
Answer: A good questionnaire should have.
- Less number of question
- Should be clear
- Proper order of question
- Question-related to the topic
- Request for return
Question 10 ( Chapter 2 Collection of Data )
Why is a pilot survey important?
Answer: A pilot survey is essential because
- It helps in assessing the quality and suitability of question
- It evaluates the performance of enumerators
- It helps in designing a set of rules for the investigator
- It estimates the time and cost involved in the final survey
Question 11 ( Chapter 2 Collection of Data )
What is the universe in statistics?
Answer: In statistics, the term universe or population indicates an aggregate of items studied for investigators.
Answer: Sample is a collection of an item from the population that represents the characteristics of the population.
Define the census method.
Answer: It is a method of collecting data where each item related to the problem of the investigation is collected.
Explain the sample method.
Answer: It is a process of collecting data in which the sample of a group of items are examined, and conclusion are drawn on their basis.
What do you mean by random sampling?
Answer: In this method, every item of the universe have an equal chance of being selected in the sample.
What is purposive or deliberate sampling?
Answer: It is a sampling method where the investor chooses the sampling items according to his opinion and best for the population.
Define stratified and mixed sampling?
Answer: In this method, the universe is divided into two groups having different characteristics and the items are selected for each group, so the entire group is represented.
Explain systematic sampling.
Answer: In systematic sampling, population unit are arranged according to the alphabets, numbers, and geography. Here, every nth numerical item is selected as a sample.
What is quota sampling?
Answer: Here, the universe is divided into two sections or group in terms of their characteristics.
What is convenience sampling?
Answer: In this method, sampling is done according to the investigator’s convenience.