2. Objectives
LC – 1. apply the principles of research design (SSP-RS8-RD-III-m-n-14)
2. make a valid experimental design (SSP-RS8-RD-III-n-15)
a. Define the term “research design”.
b. Describe the significance of a research design.
c. Identify the different types of research designs.
d. Create a valid research design.
3. Review
In this type of sampling technique, all the elements of a population
have an “equal chance” of being part of the sample of the study.
a. Probability Sampling
b. Non-Probability Sampling
c. Population
d. None of the above
4. Review
A non-probability sample does not employ the concept of “random
selection” and as such, it allows the researcher greater control in
choosing the respondents.
TRUE FALSE
5. Review
Which of the following figures best describe a
Cluster Sample?
a b c d
6. Review
Which of the following figures best describe a
Simple Random Sample?
a b c d
7. Review
Which of the following figures best describe a
Stratified Random Sample?
a b c d
8. Review
Which of the following figures best describe a
Systematic Random Sample?
a b c d
9. Review
This sampling technique is sometimes called “accidental sampling”. It
allows the researcher greater freedom in selecting his respondents
based on the respondent’s availability, schedule, etc.
What type of sampling technique is this?
CONVENIENCE SAMPLING
10. Review
In this type of sampling technique, the researcher chooses the sample
based on the desired characteristics of the elements.
PURPOSIVE SAMPLING
11. What is a Research Design?
Refers to the strategy that the
researcher employed in addressing
the research problems.
12. Importance of a Research Design
a. It reduces inaccuracy.
b. Helps to get maximum efficiency and reliability.
c. Eliminates bias and marginal errors
d. Minimizes wastage of time.
e. Helpful for collecting research materials.
f. Gives an idea regarding the type of resources required in terms of
money, manpower, time, and efforts.
g. Guides the research in the right direction.
16. Replication
• Using enough subjects to
eliminate chance variation.
• Doing so increases the statistical
accuracy of the results.
17. Control
• Conditions that are the same for
all of the experimental groups
• Experiments must have a control
to ensure that the results are
similar, and to reduce variation.
18. Blocking
• Grouping the subjects into
“blocks” where the elements have
similar characteristics
• Once again, blocking reduces
variation of the results
19. Experimental Research Designs:
• Completely Randomized Design
• Randomized Block Design
• Match Pairs Design
https://www.youtube.com/watch?v=10ikXret7Lk&t=317s
20. Activity:
Directions: Determine the research design used in the following
scenarios.
1. A researcher wishes to find out if a certain type of animal feeds is
effective in inducing weight gain on chickens. 20 chickens were used
in the experiment. All of the chickens were randomly assigned into
two groups, the experimental group – the one being fed with the
animal feeds in question and the control group – the one being fed
with commercial animal feeds.
What research design was used in this experiment?
21. Activity
2. A researcher wishes to determine the effect of a fertilizer on the
growth of a certain plant. The researcher initially planted
22. A researcher wishes to find out if a certain type of animal feeds is
effective in inducing weight gain on chickens. 20 chickens were used in
the experiment. All of the chickens were randomly assigned into two
groups, the experimental group – the one being fed with the animal
feeds in question and the control group – the one being fed with
commercial animal feeds.
Completely Randomized Randomized_Block
_Match Pairs _Correlational
23. A science teacher wishes to demonstrate the effect of vinegar on
chicken bones. The teacher prepared 6 similar sized chicken bones,
three containers containing 50 mL of vinegar, and three containers with
50 mL of mineral water. The teacher randomly assigns the bones on a
random container.
Completely Randomized Randomized_Block
_Match Pairs _Correlational
