Database Reference
In-Depth Information
Example 4:
Average response time of the system:
Administering the Questionnaire
Options for administering the questionnaire include the following:
•
Convening respondents together at one time.
•
Personally handing out blank questionnaires and collecting
completed ones.
•
Allowing respondents to self-administer the questionnaire at
work and leave it at a centrally located place.
•
Mailing questionnaires with instructions, deadlines, and return
postage.
•
Using the facilities of the World Wide Web (WWW), for example
e-mail, user forums and chat rooms.
A3.4 Sampling and Experimenting
Sampling is useful when the information required is of a quantitative nature or can
be quantified, no precise detail is available, and it is not likely that such details will be
obtained via other methods. Figure
A3-3
provides an example of a situation in which
sampling is relevant.
Figure A3-3.
Examining the Delivery of Orders After Customer Complaints
Sampling theory describes two broad categories of samples:
•
Probability sampling
involving random selection of elements.
•
Non-probability sampling
where judgment is applied in selection
of elements.
