Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Collection of Data — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
The first stage of a statistical investigation is:
- A.Analysis
- B.Collection of data
- C.Presentation
- D.Interpretation
2.
Data collected first-hand by the investigator are:
- A.Secondary data
- B.Primary data
- C.Old data
- D.Published data
3.
Data already collected by someone else and reused are:
- A.Primary data
- B.Secondary data
- C.Raw data
- D.Field data
4.
Which is an advantage of secondary data?
- A.Always perfectly suited
- B.Saves time and money
- C.Never needs checking
- D.Always primary
5.
The Census of India report is an example of a ____ source.
- A.Published secondary
- B.Primary
- C.Unpublished
- D.Sample
6.
The whole group being studied is called the:
- A.Sample
- B.Population (universe)
- C.Unit
- D.Schedule
7.
Studying every single unit of the population is the:
- A.Sample method
- B.Census method
- C.Random method
- D.Mail method
8.
Which method is cheaper and faster for large populations?
- A.Census method
- B.Sample method
- C.Complete enumeration
- D.Full count
9.
In random sampling, every unit has:
- A.No chance
- B.An equal chance of selection
- C.A fixed place
- D.Double weight
10.
Dividing the population into groups and sampling each is called:
- A.Random sampling
- B.Stratified sampling
- C.Systematic sampling
- D.Census
11.
Questioning informants face-to-face personally is:
- A.Direct Personal Investigation
- B.Mailed questionnaire
- C.Correspondents
- D.Schedule method
12.
Questioning witnesses instead of the informants themselves is:
- A.Direct Personal Investigation
- B.Indirect Oral Investigation
- C.Mailed questionnaire
- D.Census
13.
A list of questions the informant fills in himself is a:
- A.Schedule
- B.Questionnaire
- C.Ledger
- D.Register
14.
A schedule is filled in by the:
- A.Informant
- B.Enumerator
- C.Correspondent
- D.Editor
15.
The difference between the sample and the true population value is called:
- A.Sampling error
- B.Census
- C.Bias removal
- D.Tally
Section B — Challenge / Olympiad (2 marks each)
10 × 2 = 20 marks
16.
A researcher surveys 500 students about study hours, contacting each one herself. The data she gets are:
- A.Primary data collected by direct personal investigation
- B.Secondary data
- C.Published data
- D.Sampling error
17.
A TV-rating agency studies a few thousand households instead of all households. It is using the sample method mainly because studying everyone would be:
- A.Too costly and slow
- B.More accurate and cheap
- C.Impossible in theory
- D.Illegal
18.
Before using figures from a 10-year-old report, an economist must first check whether the data are:
- A.Reliable and suited to the present purpose
- B.Primary
- C.Free of charge
- D.Hand-written
19.
An enquiry into people's drinking habits is best done by indirect oral investigation because informants:
- A.May be unwilling to answer directly
- B.Are always honest
- C.Cannot speak
- D.Live far away only
20.
A mailed questionnaire is unsuitable for a village with many illiterate adults because they:
- A.Cannot read or fill it themselves
- B.Have no address
- C.Dislike paper
- D.Are too busy
21.
The Census of India uses enumerators to fill schedules because this method:
- A.Works for a huge population including illiterate people
- B.Is the cheapest
- C.Needs no staff
- D.Studies only a sample
22.
A sample drawn only from one rich neighbourhood to represent a whole city is faulty because it is not:
- A.Representative of the whole population
- B.Large enough only
- C.Written down
- D.Primary
23.
Choosing every 10th name from a list is an example of:
- A.Systematic sampling
- B.Stratified sampling
- C.Census
- D.Direct personal investigation
24.
Newspapers gathering news from local agents across the country is an example of collecting data through:
- A.Correspondents
- B.A schedule
- C.A census
- D.Direct personal investigation
25.
To reduce sampling error, an investigator should use a sample that is:
- A.Large and randomly, representatively chosen
- B.Very small
- C.From one group only
- D.Picked by personal liking
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Collection of data
- (B) Primary data
- (B) Secondary data
- (B) Saves time and money
- (A) Published secondary
- (B) Population (universe)
- (B) Census method
- (B) Sample method
- (B) An equal chance of selection
- (B) Stratified sampling
- (A) Direct Personal Investigation
- (B) Indirect Oral Investigation
- (B) Questionnaire
- (B) Enumerator
- (A) Sampling error
Section B — Challenge / Olympiad (2 marks each)
- (A) Primary data collected by direct personal investigation
- (A) Too costly and slow
- (A) Reliable and suited to the present purpose
- (A) May be unwilling to answer directly
- (A) Cannot read or fill it themselves
- (A) Works for a huge population including illiterate people
- (A) Representative of the whole population
- (A) Systematic sampling
- (A) Correspondents
- (A) Large and randomly, representatively chosen
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