Differentiate between Primary Data and Secondary Data.
Differences between Primary Data and Secondary Data:
|
Basis of Difference |
Primary Data |
Secondary Data |
|
1. Definition |
1. They are collected for the first time. |
1. They have already been collected by some other persons. |
|
2. Accuracy |
2. They are accurate. |
2. They lack accuracy. |
|
3. Nature of Data |
3. They are in the form of raw data to which statistical methods are applied. |
3. They are in the form of finished products. |
|
4. Editing |
4. They do not require editing. |
4. They require editing. |
|
5. Time and money |
5. Collection of primary data requires a lot of time and money. |
5. They dp not require a lot of time and money. |
|
6. Precaution |
6. Precaution is not required in the use of primary data. |
6. Precautions are required in the use of secondary data. |
Write down the essential qualities of a good questionnaire.
Essentials of a good questionnaire:Following are the essentials of a good questionnaire:
1. Limited number of questions:The number of questions should be limited as far as possible. Normally fifteen to twenty questions are sufficient enough for making the required enquiry.
2. Simplicity:The language of the questions should be simple and easily understandable. It should be clear and not vague. It should not convey two meanings.
3. Logically arranged:The questions should be arranged logically. Ther should be a proper sequence of the questions.
4. Related to the points:Questions should be related to the point. They should not be irrelevant.
5. Avoiding personal questions:Personal questions should be avoided as far as possible. For example, questions about income, volume of sales etc. should not be asked.
Show the following data with the help of a bar-diagram. Through which media do the people know about the product?
Median Influence
|
Advertisement |
Families influenced |
|
Television |
47 |
|
Newspaper |
30 |
|
Magazines |
20 |
|
Cinema |
25 |
|
Sales representative |
15 |
|
Exhibits - Stall |
10 |
|
Radio |
18 |
Observation : Majority of people came to know about the product either through television or through newspaper.
From the following information, tell us which type of air conditioner you will prefer to buy and why? (Find out with the help of arithmetic mean).
Consumers Awareness about air-conditioners
(in percentage)
|
Awareness |
Name of the Companies |
|||||
|
Videocon |
National |
Samsung |
L.G. |
Voltas |
Others |
|
|
Brand |
14 |
10 |
20 |
18 |
8 |
9 |
|
Price |
25 |
5 |
12 |
28 |
19 |
5 |
|
After sale service |
18 |
6 |
17 |
21 |
12 |
8 |
|
Technology |
22 |
8 |
12 |
17 |
14 |
10 |
Calculation of Arithmetic Mean:
Consumer Awareness about air-conditioners
|
Awareness |
Name of the Companies |
|||||
|
Videocon |
National |
Samsung |
L.G. |
Voltas |
Others |
|
|
Brand |
24 |
10 |
20 |
18 |
8 |
9 |
|
Price |
25 |
5 |
12 |
28 |
9 |
5 |
|
After sale service |
18 |
6 |
17 |
21 |
12 |
8 |
|
Technology |
22 |
8 |
12 |
17 |
14 |
10 |
|
ΣX |
89 |
29 |
61 |
84 |
43 |
32 |
|
|
22.25% |
7.25% |
15.25% |
21% |
10.75% |
8.50% |
Switch
