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Quantitative Techniques – I

Notes 18. In ................................. form, the data are available in magazines, research papers,
newspapers, government publications, international publications, etc.
(a) Published (b) Unpublished

(c) Reduced (d) Enlarged

Case Study Chand Contractors

hand Contractors supplies contract labor to various industrial units for carrying
out their various production activities in and around Bhilai. Mr.R.B. Tripathi is the
Cchief consultant and is responsible to manage the continuous supply of contract
labor on weekly basis. The daily wages of contract labor varies from 25 to 95 per day
depending on the skill, experience and the nature of work in the industry utilising the
services of contract laborers. The daily wages and number of workers data have been
compiled by Shri Tripathi for estimating the number of workers demanded and their
average wages.

Daily Wages ( ) No. of Workers Daily Wages ( ) No. off workers
20-25 21 60-65 36
25-30 29 65-70 45
30-35 19 70-75 27
35-40 39 75-80 48
40-45 43 80-85 21
45-50 94 85-90 12
50-55 73 90-95 5
55-60 68

1. Draw a suitable diagram of the data to enable the chief executive of Chand Contractors
to understand the relations between wages and number of workers.

2. Find out the number of workers getting wages lower than 57 and more than
77 using Ogive graphs.

5.4 Summary

The stage of collection of data follows the stage of planning of a statistical investigation.

The process for the collection of data depends upon the objective, scope, nature of
investigation, etc.
The data may be collected either from a primary or from a secondary source.

Data from a primary source are original and correspond to the objective of investigation.
The secondary data are often available in published form, collected originally by some
other agency with a similar or different objective.

The primary data are more reliable than the secondary data which, however, are more
economical.
There are several methods of collection of primary data.

The choice of a particular method depends, apart from objective, scope and nature of
investigation, on the availability of resources, literacy level of the respondents, etc.

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