DATA COLLECTION

Topics: Sampling, Sample, Stratified sampling Pages: 39 (1567 words) Published: April 18, 2015
DATA COLLECTION
Business Statistics
Math 122a
DLSU-D
Source: Elementary Statistics (Reyes, Saren)

Methods of Data Collection
1.
2.
3.
4.
5.

DIRECT or INTERVIEW METHOD
INDIRECT or QUESTIONNAIRE
METHOD
REGISTRATION METHOD
OBSERVATION METHOD
EXPERIMENT METHOD

DIRECT or INTERVIEW
Use at least two (2) persons – an
INTERVIEWER & an INTERVIEWEE/S –
exchanging information.
 Gives us precise & consistent information
because clarifications can be made.
 Questions not fully understood by the
respondent, may be repeated until it suits
the interviewee’s level.

DIRECT or INTERVIEW
Time consuming
 Expensive
 Limited coverage


INDIRECT or QUESTIONNAIRE
This is a method where written answers
are given to prepared questions.
 Compared to the Direct method, this
requires less time
 It is inexpensive since the questionnaires
can simply be mailed or hand-carried.
 Gives the respondent a sense of freedom
in honesty answering the questions
because of secrecy.

REGISTRATION METHOD
This is a method enforced by certain laws.
Examples:
 Registration of birth
 Registration of marriage
 Registration of death

OBSERVATION
This is a method which observes the behavior,
characteristic, reaction, interaction of individuals or
organizations in the study.
Observe: To notice using a full range of appropriate
senses. To see, hear, feel, taste, and smell

This is also used when the respondents cannot read
nor write.

EXPERIMENT
This method is used when the objective
of the study is to determine the cause
and effect of certain phenomena or
event.

Characteristics Of
A Good Question
1.

A good question is unbiased.




Must not be worded in a manner that will
influence the respondent to answer in a
certain way, that is to favor a certain
response or to be against it.
An unbiased question is stated in neutral
language and has no element of pressure.

Characteristics Of
A Good Question
Examples of unbiased questions:
 Do you watch Korean Novelas?
 Do you like classical music?
 Are you in favor of legalizing divorce in
the Philippines?

Characteristics Of
A Good Question
Examples of biased questions:
 Do you watch corny Korean Novelas?
 Do you like boring classical music?
 Are you in favor of destroying the
sanctity of marriage by legalizing divorce
in the Philippines?

Characteristics Of
A Good Question
2.

A good question must be clear
and simply stated.



This is to makes your question easier to
understand and
More likely to be answered truthfully.

Characteristics Of
A Good Question
Examples of simple and clear questions:
 What is your average grade last
semester?
 How many units are you enrolled in this
semester?

Characteristics Of
A Good Question
Examples of NOT so simple and clear
questions:
 What is your academic performance last
semester?
 How heavy is your academic load this
semester?

Characteristics Of
A Good Question
3.

A good question must be precise.
Questions must not be vague.
 It should indicate clearly the manner
how the answers must be given.


Characteristics Of
A Good Question
Examples of precise questions:
 In terms of mathematical ability, do you
think male and female are equal?
 Did the restaurant staff smiled while
taking your order?

Characteristics Of
A Good Question
Examples of vague questions:
 Do you think male and female are equal?
 Was the restaurant staff friendly?

Characteristics Of
A Good Question
4.

Good questionnaires lend
themselves to easy analyses.

Two (2) Categories
of Survey Questions
1.

OPEN QUESTION



An open question allows a free response.
Examples:




What are the things you consider before buying a
cellphone?
What do you think can be done to reduce the
volume of plastic bags waste in Cavite?

Two (2) Categories
of Survey Questions
2.

CLOSED QUESTION



A closed...
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