# NCERT Solutions for Class 11 Economics Statistics for Economics Chapter 2

## Collection of Data Class 11

### Exercise : Solutions of Questions on Page Number : 20

Q1 :

Which of the following is the most important when you buy a new dress?

Which of the following is the most important when you buy a new dress?

a. Colour

b. Brand

c. Price

d. Size

Q2 :

How often do you use computers?

How often do you use computers?

a. Less than 1 hour a day

b. 1 to 3 hours a day

c. 3 to 5 hours a day

d. More than 5 hours

Q3 :

Which of the following newspaper/s do you read regularly?

Q4 :

Rise in the price of petrol is justified.

Q5 :

What is the monthly income of your family?

Q6 :

Frame five two-way questions (with 'Yes' or 'No').

Q7 :

There are many sources of data (true/false).

Q8 :

Telephone survey is the most suitable method of collecting data, when the population is literate and spread over a large area (true/false).

Q9 :

Data collected by investigator is called the secondary data (true/false).

Q10 :

There is a certain bias involved in the non-random selection of samples (true/false).

Q11 :

Non-sampling errors can be minimised by taking large samples (true/ false).

Q12 :

How far do you live from the closest market?

Q13 :

If plastic bags are only 5 percent of our garbage, should it be banned?

Q14 :

Wouldn't you be opposed to increase in price of petrol?

Q15 :

(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?

Q16 :

You want to research on the popularity of Vegetable Atta Noodles among children. Design a suitable questionnaire for collecting this information.

Q17 :

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.

Q18 :

Give two examples each of sample, population and variable.

Q19 :

Which of the following methods give better results and why?

 (a) Census (b) Sample

Q20 :

Which of the following errors is more serious and why?

 (a) Sampling error (b) Non-Sampling error

Q21 :

Suppose there are 10 students in your class. You want to select three out of them. How many samples are possible?

Q22 :

Discuss how you would use the lottery method to select 3 students out of 10 in your class?

Q23 :

Does the lottery method always give you a random sample? Explain.

Q24 :

Explain the procedure of selecting a random sample of 3 students out of 10 in your class, by using random number tables.