Data can be collected through conducting surveys, observing events, taking measurements in experiments, and reading statistical publications. Some common survey methods are interviews, questionnaires, and observation. Experiments involve taking measurements of objects to collect numeric data. Large datasets are often obtained from government statistical publications. An example is provided of a teacher collecting birthday data on students through checking records, surveys, and collecting response forms.

1. Collection
of Data
G7 MATHEMATICS

2. Data are
collection of facts
or information.

3. Data may be gathered by
using the following method:
1. Conducting surveys
2. Observing the outcome of events
3. Taking measurements in
experiments
4. Reading Statistical Publications

4. 1.Conducting Surveys
Surveys may be conducted through face-to-face interviews,
telephone inquiries, and self-completed questionnaires that
are returned by mail or completed online.
The Interview Method is done when a
person solicits information from
another person. The person gathering
the data is called the interviewer, while
the person supplying the data is called
the interviewee.
Interview Method
If the survey involves a series of
questions, the interview will be a
very tedious one to employ.
Hence, the Questionnaire Method
is advisable.
Questionnaire Method

5. They are used to collect
information like personal
favorites as shown in the
following example:

6. Not all surveys gather information
about people. There are surveys about
cars, buildings and etc.

7. We can use direct observation to collect data from daily
life such as the following:
2. Observing Outcomes of Events
a. The number of cars
passing through a certain
junction between 7:00 AM
to 8:00 AM
b. The number of passengers
in a queue for counter service
at an airport.

8. In science and quality control, we often collect data by
conducting experiments to take measurements of
particular objects of interest.
3. Taking Measurements in Experiments
a. Bacteria count in a culture b. The lifetime of battery can
be tested in a quality-control
laboratory.

9. Some data related to economic conditions and the population of a country are
obtained by large scale surveys that cannot be done by an individual or a small
firm. We can obtain these types of data from official statistics published by the
government.
4. Reading Statistical Publication
a. The National Statistics Office of the
Philippines has a useful website that
provides reliable and up-to-date Philippine
statistics at https://psa.gov.ph/
b. Crime statistics from Philippine
National Police can be found at
https://pnp.gov.ph/

10. Let’s Try!
Mrs. Rivera wants to find the number of students in her advisory
class who has birthday falling on each of the 12 months. She
collects the data in the following manner:
1. Check the date of
birth of each
students in the
class registry.
(Reading Publication)
2. Ask the students to
raise their hands if
their birthdays fall in
a the certain month.
(Conducting Survey)
3. Make a form and
ask the students to
write their birthdates
and return the form.
(Conducting Survey)
Choices:
Conducting Surveys Observing the
Outcome of Events
Taking Measurements in Experiments Reading Statistical Publications

11. Let’s Review!
11
Conducting
Surveys
Observing
the outcome
of events
Taking
measurements
in experiments
Reading
Statistical
Publications

12. Suggest a way to collect each set of Data.
1. Population of Region 1, Region 2, and Region 3
2. Effectiveness of the New Secondary Curriculum
3. Heights of the 20 applicants
4. Number of customers in a restaurant from 10AM to 11PM
5. Opinions of commuters about the color-coding scheme.
6. Body temperature of the patients in Level 1
7. Favorite sports of the freshmen
8. Total number of voters in the last 2010 election
9. Popularity of Korean telenovelas
10. Actual volume of each pack of mango juice
Reading Publications
Observing Outcomes
Taking Measurements
Observing Outcomes
Conducting Surveys
Taking Measurements
Conducting Surveys
Reading Publications
Conducting Surveys
Taking Measurements
Choices:
Conducting Surveys Observing the
Outcome of Events