Page 43 - DMGT209_QUANTITATIVE_TECHNIQUES_II

Quantitative Techniques-II

Notes 2.9.5 Determine the Sample Size

Smaller the sample size, larger the error and vice-versa.
Sample size depends upon
(a) Accuracy required
(b) Time available

(c) Cost involved.

!
Caution While selecting the sample, the sample unit has to be clearly specified.

Example: Survey on the attitudes towards the use of shampoo with reference to a specific
brand, where husbands, wives or a combination of them are to be surveyed or a specific segment
is to be surveyed. The sample size depends on the size of the sample frame/universe.

2.9.6 Organize the Fieldwork

This includes selection, training and evaluating the field sales force to collect the data:

(a) How to organise the field-work?
(b) What type of questionnaire - structured or unstructured to use?
(c) How to approach the respondents?
(d) Week, day and time to meet the specific respondents etc., are to be decided.

2.9.7 Analysis of the Data

This involves:

(a) Editing
(b) Tabulating
(c) Codifying.
Editing: The data collected should be scanned to make sure that it is complete and that all the
instructions are followed. This process is called editing. Once these forms have been edited, they
must be coded.

Coding means assigning numbers to each of the answers, so that they can be analysed.
The final step is called data tabulation. It is the orderly arrangement data in a tabular form. Also,
at the time of analysing the data, the statistical tests to be used must be finalised such as T-Test,
Z-Test, Chi-square Test, ANOVA etc.

Tasks
A. Given the following decision problem, identify the research problem:
1. Whether to expand the available warehouse facilities.
Contd...

38 LOVELY PROFESSIONAL UNIVERSITY