Question 1

Q1: 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 d...

Accepted Answer

Here are four appropriate multiple-choice options for each question: (i) Which of the following is the most important when you buy a new dress? (a) Price (b) Brand (c) Quality of fabric (d) Colour and design (ii) How often do you use computers? (a) Daily (b) 2-3 times a week (c) Occasionally (d) Nev...

Question 2

Q10: Suppose there are 10 students in your class. You want to select three out of them. How many samples are possible?

Accepted Answer

To find the number of possible samples of 3 students from a group of 10, we need to calculate the number of combinations. The formula for combinations is: C(n, k) = n! / (k!  (n-k)!) Where:    n = total number of items (population) = 10    k = number of items to choose (sample size) = 3 Calculation:...

Question 3

Q11: Discuss how you would use the lottery method to select 3 students out of 10 in your class.

Accepted Answer

The lottery method is a simple way to ensure that every student has an equal chance of being selected. The procedure would be as follows: 1.  Assign Numbers: First, assign a unique number from 1 to 10 to each of the 10 students in the class. 2.  Prepare Slips: Take 10 identical slips of paper. They...

Question 4

Q12: Does the lottery method always give you a random sample? Explain.

Accepted Answer

Yes, the lottery method always gives a random sample, provided it is executed correctly. Explanation: The fundamental principle of random sampling is that every individual unit in the population must have an equal and independent chance of being selected in the sample. The lottery method is designed...

Question 5

Q13: Explain the procedure for selecting a random sample of 3 students out of 10 in your class by using random number tables.

Accepted Answer

Using random number tables is another method to ensure a random selection. The procedure is as follows: 1.  List and Assign Numbers: First, make a list of all 10 students in the class. Assign a unique number to each student, from 0 to 9. 2.  Refer to a Random Number Table: Take a standard table of r...

Question 6

Q14: Do samples provide better results than surveys? Give reasons for your answer.

Accepted Answer

This question seems to contain a misunderstanding. A sample is a part of a survey; a survey is the method of collecting data, which can be conducted either on a sample (a sample survey) or on the entire population (a census survey). The question should likely be interpreted as: "Do sample surveys pr...

Question 7

Q2: Frame five two-way questions (with 'Yes' or 'No').

Accepted Answer

Five two-way questions with 'Yes' or 'No' answers are: 1.  Do you have a library card for the city library? (Yes/No) 2.  Is your school located within 3 kilometers of your home? (Yes/No) 3.  Have you ever participated in a school sports event? (Yes/No) 4.  Do you think online classes are as effectiv...

Question 8

Q3: State whether the following statements are True or False. (i) There are many sources of data. (ii) Telephone survey is the most suitable method of col...

Accepted Answer

(i) True. As discussed in the chapter, data can be obtained from primary sources (collected firsthand by the researcher) and secondary sources (collected by other agencies). (ii) False. For a literate population spread over a large area, a mailing (questionnaire) survey is more suitable as it is les...

Question 9

Q4: What do you think about the following questions? Do you find any problem with these questions? Describe. (i) How far do you live from the closest mark...

Accepted Answer

Yes, there are problems with some of these questions based on the principles of good questionnaire design. (i) How far do you live from the closest market?    Problem: This question is ambiguous. The term 'far' is subjective and can be interpreted differently by different people.     Improvement: Th...

Question 10

Q5: You want to do a research on the popularity of Vegetable Atta Noodles among children. Design a suitable questionnaire for collecting this information.

Accepted Answer

Questionnaire: Popularity of Vegetable Atta Noodles Instructions: Please tick the most appropriate option. Your responses will be kept confidential and used for research purposes only. 1.  What is your age?        (a) 5-8 years        (b) 9-12 years        (c) 13-15 years 2.  Do you like eating inst...

Question 11

Q6: 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. What is the populati...

Accepted Answer

Based on the definitions provided in the chapter:    Population: The population (or universe) in statistics refers to the totality of the items under study. In this case, the study is about the cropping pattern in a specific village. Therefore, the population is all 200 farms in the village.    Samp...

Question 12

Q7: Give two examples each of sample, population and variable.

Accepted Answer

Here are two examples for each term based on the chapter: Population: 1.  All the students enrolled in Class 11 in all schools of a city. 2.  The total number of agricultural labourers in the state of Punjab. Sample: 1.  A group of 500 students selected from different schools in the city to study th...

Question 13

Q8: Which of the following methods give better results and why? (a) Census (b) Sample

Accepted Answer

Neither method is universally better; the choice depends on the purpose of the survey, available resources (time and money), and the required level of accuracy. Census Method:    Advantages: It provides complete and accurate information because every single item of the population is studied. It is f...

Question 14

Q9: Which of the following errors is more serious and why? (a) Sampling error (b) Non-Sampling error

Accepted Answer

Non-sampling error is more serious than sampling error. Reasoning:    Sampling Error: This error arises because the study is based on a sample instead of the entire population. It is the difference between the sample estimate and the actual population parameter. The magnitude of sampling error can b...

NCERT Solutions