RBSE Solutions for Class 11 Economics Chapter 2 Collection of Data

Rajasthan Board RBSE Solutions for Class 11 Economics Chapter 2 Collection of Data Textbook Exercise Questions and Answers.

RBSE Class 11 Economics Solutions Chapter 2 Collection of Data

RBSE Class 11 Economics Collection of Data Textbook Questions and Answers

Question 1.
Frame at least four appropriate multiple-choice options for following questions:
(i) Which of the following is the most important, when you buy a new dress?
(ii) How often do you use computers?
(iii) Which of the newspapers do you read regularly?
(iv) Rise in the price of petrol is justified.
(v) What is the monthly income of your family?
Answer:
(i) (a) Price 
(b) Colour
(c) Brand 
(d) Style

(ii) (a) Every day 
(b) Once a weak
(c) Once in six months 
(d) Once a year

(iii) (a) The Tribune 
(b) Indian Express
(c) Hindustan Times 
(d) Punjab Kesan

(iv) (a) Yes 
(b) No
(c) Sometime 
(d) Can’t say

(v) (a) Below ₹ 5,000 
(b) ₹5000 - ₹10.000
(c) ₹10,000 - ₹20,000 
(d) Above ₹ 20,000

Question 2. 
Frame five two-way questions (with ‘Yes’ or ‘No’).
Answer:
Examples of two-way questions:
(i) Do you think that the population of India has increased two fold since 1980s? (Yes/No)
(ii) Can we collect data through surveys also? (Yes/No)
(iii) Do you think homeopathy is safer than allopathy? (Yes/No)
(iv) Does every individual have an equal chance of being selected in random sampling? (Yes/No)
(v) Is data collection free of errors? (Yes/No)

Question 3. 
(i) There are many sources of data. (true/false)
(ii) Telephone survey is the most suitable method of collecting data, when the population is literate and spread over a large area. (true/false)
(iii) Data collected by investigator is called the secondary data. (true/false)
(iv) There is a certain bias involved in the non-random selection of samples. (true/false)
(v) Non-sampling errors can be minimised by taking large samples. (true/false)
Answer:
(i) True 
(ii) True 
(iii) False 
(iv) True 
(v) False

Question 4. 
What do you think about the following questions. Do you find any problem with these questions’ If yes. how
(i) How far do you live from the closest market’
(ii) If plastic bags are only 5 percent of our garbage. should it be banned
(iii) Wouldn’t you be opposed to increase in price of petrol
(iv) 
(a) Do you agree with the use of chemical fertilisers
(b) Do you use fertilisers in your fields’
(c) What is the yield per hectare in your field’
Answer:
(i) Yes. The corrected form is: What is the difference between your home and the closest market?
(ii) Yes. The corrected form is: Why should plastic bags be banned if they form only 5 percent of our garbage?
(iii) Yes. The corrected form is: How does an increase in the price of petrol affect the common man?
(iv) (a), (b), (c): No error

Question 5. 
You want to research on the popularity of Vegetable Atta Noodles among children. Design a suitable questionnaire for collecting this information.
Answer:
A sample questionnaire to research on the popularity of Vegetable Atta Noodles among children is given below:

Question 6. 
In a village of 200 farms, a study was conducted to find the cropping pattern. Out of the 50 farms surveyed, 50% grew only wheat. Identify the population and the sample here.
Answer:
In the given statement, population is 200 farms and sample is 50 farms.

Question 7. 
Give two examples each of sample, population and variable.
Answer:
Sample is a smaller group selected from the population from which the relevant information would by sought. Examples:
(i) Study of living standard of 100 households from a village, which constitutes 1000 households.
(ii) Out of 500 farms, 125 farms are selected to study the impact of chemical fertilisers.

Population covers each individual or unit belonging to the population. 
Examples:
(i) Census of India
(ii) Study the number of animals in a zoo

Variable is a statistical value that varies from one item to another. 
Examples:
(i) Height    
(ii) Income

Question 8.
Which of the following methods give better results and why
(a) Census (b) Sample .
Answer:
Census method is a form of a survey which includes every element of the population. It is also known as the method of complete enumeration. The essential feature of this method is that it covers every individual unit in the entire population. Although this method is time-consuming and expensive, it yields more accurate results and the margin of error is very less.

A sample refers to a section of the population from web information to be obtained. Most of the surve same sample iron These are prepared in statistics because of a number of reasons
(i) A sample survey can provide reasonably accurate and reliable information at lower cost and in shorter time.
(ii) Samples are smaller than population and hence, more detailed information can be collected by conducting intensive enquiries.

Question 9. 
Which of the following errors is more serious and why?
(a) Sampling error (b) Non-Sampling error
Answer:
Non-sampling errors are more serious than sampling errors because a sampling error can be minimised by taking a large sample. However, it is difficult to minimise non-sampling errors, even by taking a large sample.

Question 10.
Suppose there are 10 students in your class.You want to select three out of them. How many samples are possible?
Answer:
In order to finds out the number of possible samples of 3 out of 10 students, the following formula for combination can be applied:

Question 11. 
Discuss how you would use the lottery method to select 3 students out of 10 in your class?
Answer:
The lottery method to select 3 students out of 10 in a class can be used in the following way:
(i) Prepare 10 slips of paper.
(ii) Write the names of each of the 10 students on the slips.
(iii) Put these slips in a bag or box.
(iv) Mix them well.
(v) Take out three slips the bag or box.
The names on these three slips will be the names of the selected students.

Question 12. 
Does the lottery method always give you a random sample? Explain.
Answer:
In lottery method, there is an equal possibility of selection of each item. Thus, this method always gives a random sample.

Question 13. 
Explain the procedure of selecting a random sample of 3 students out of 10 in your class, by using random number tables.
Answer:
Random sampling is the one in which the individual units from the population are selected at random. The procedure of selecting a random sample of 3 students out of 10 in your class using random number tables is as below: 
(i)  Assign numbers to all the students in the class from 1 to 30.
(ii) Take a table of two-digit random numbers.
(iii) Start using the table from anywhere, that is, from any page, column, row or point
(iv) Since there are 30 students in the class, skip the random numbers greater than 30.

Question 14. 
Do samples provide better results than surveys? Give reasons for your answer.
Answer:
Yes, samples provide better results than surveys. A sample refers to a group or section of the population from which information is to be obtained. Most of the surveys are sample surveys. These, are preferred in statistics because of a number of reasons:
(i)  A sample survey can provide reasonably accurate and reliable information at lower cost and in shorter time.
(ii) Samples are smaller than population and hence, more detailed information can be collected by conducting intensive enquiries.