Statistics Introduction for Grade 7

2. •Definition of statistics
Statistics is the science of conducting
studies to collect, organize, summarize,
analyze, and draw conclusions from data.
How many
candies?
How many
lollipops?
How many
percent is
gummy
worm?

3. The five Basic Terms of
Statistics
1. Population
2. Sample
3. Parameter 4. Statistic
5. Variable

4. Ex. All Filipino citizens who are
currently registered to vote
1.Population – all the members of a group about
which you want to draw a conclusion.

5. 2. Sample – the part of the population selected for
analysis.
Ex: The registered voters selected to
participate in a recent survey concerning
their intention to vote in the next election.

6. 3. Parameter – a numerical measure that
describes a characteristic of a population.
Ex. The percentage of
all registered voters
who intend to vote in
the next election

7. 4. Statistic – a numerical measure that describes
a characteristic of a sample.
Ex. The percentage in a sample of
registered voters who intend to vote in the
next election.

8. Ex. Gender, the household income of the
citizens who voted in the last presidential
election.
5. Variable – a characteristic of an item or an
individual that will be analyzed using statistics.

9. The two branches of statistics

11. 1.Descriptive statistics – consists of the
collection, organization, summarizations, and
presentation of data.
Ex: a. Nine out of ten on
the job fatalities are men
b. Expenditures for
the cable industry
were P5.66 billion in
1996

12. 1. Inferential statistics consists of generalizing from
samples to populations, performing estimations and
hypotheses tests, determining relationships among
variables, and making predictions.
Ex. a. By 2040 at least 3.5
billion people will run short
of water.
b. Allergy therapy
makes bees go away

13. 1. All patients treated at a particular hospital last year.
2. The entire daily output of a cereal factory’s
production line
3. The patients selected to fill out a particular-satisfaction
questionnaire.
4. 100 boxes of cereal selected from a factory’s production
line.
5. The percentage of all patients who are very satisfied with
the care they received.
6. The percentage in a sample of patients who are very
satisfied with the care they received.
7. The number of varieties of a brand of cereal.
A. Identify the basic terms in statistics which
represent in the following situations.
Situations:
(population)
(sample)
(parameter)
(statistic)
(variable)
(population)
(sample)

14. B. In each of the following, tell whether descriptive
or inferential statistics have been used.
1.The median household income for people aged
25-34 is P35,888.
2.Drinking decaffeinated coffee can raise
cholesterol levels by 7%.
3.The national average annual medicine
expenditure per person is P1052.
4.Expert say that mortgage rates may soon hit
bottom.
5.The average age of citizens who voted for the
winning candidates in the last presidential
election.
(descriptive)
(inferential)
(descriptive)
(inferential)
(descriptive)