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In order to obtain a representative
sample in the application of this questionnaire, it was determined
to be carried out in the six municipal delegations, being
distributed in accordance with sampling criteria. This enabled
the acquisition of a data base applicable to the statistical
program SPSS.
The qualified and supervised personnel
gathered the information from the households in which, in
a random way, were determined their application.
The fieldwork was done during a four
day period, with four surveyors aided by a supervisor, who
in turn, coordinated the application of the questioner, as
well as the gathering of the information.
III.A.- Sampling:
783 surveys were done, with 95% reliability,
and a 3.5% margin of error; representative of Tijuana's population
over 18 years of age.
Samples were obtained from the six
municipal delegations as follows:
| Delegation |
No.
Surveys |
% |
| Mesa
de Otay |
142 |
18.1% |
| La
Mesa |
132 |
16.9% |
| La
Presa |
132 |
16.9% |
| San
Antonio |
132 |
16.9% |
| Centro |
125 |
16.0% |
| Playas |
120 |
15.3% |
| Total |
783 |
100.0%
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III.B.- Data Collection Method:
The method used for the random selection
of the households that participated in the study was the -Probability
by Area- method. The sample was distributed proportionally,
according with the population of each neighborhood under study,
fulfilling the quotas of the social and economic level already
established.
The requirements for the application
of the questionnaire were:
1. Residence: Tijuana, BC
2. Age: 18 years or older.
III.C. - Fieldwork:
There were 4 trained surveyors, as
well as a field supervisor in order to gather the information;
the time spent per questionnaire was between 3 to 5 minutes.
The fieldwork took place during a 4
day span; namely, from June 9th to June 13th 2001.
IV.D. - Validation:
The survey was validated and supervised
in the following manner:
1. Directly on the field, or in the households.
2. Through the statistical program, SPSS, while working
with the data base.
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III.-
METHODOLOGY 