The document discusses key concepts in scientific research methodology. It describes the scientific method as starting with general questions and hypotheses, then designing specific research to analyze variables. Variables can be independent, dependent, or confounding factors that must be controlled. Researchers formulate problems and hypotheses to test, often a null hypothesis against an alternative. Methods must be chosen and measurements operationalized to accurately reflect the problem. Research must demonstrate validity, reliability, and the ability to generalize conclusions. Statistical significance tests are used to analyze results and determine whether to accept or reject hypotheses, while accounting for possible errors.
Meaning of research - Research Methodology - Manu Melwin Joymanumelwin
Research in common parlance refers to a search for knowledge. Once can also define research as a scientific and systematic search for pertinent information on a specific topic. In fact, research is an art of scientific investigation.
Research is a systematic inquiry to describe, explain, predict and control the observed phenomenon. Research involves inductive and deductive methods (Babbie, 1998). Inductive methods analyze the observed phenomenon and identify the general principles, structures, or processes underlying the phenomenon observed; deductive methods verify the hypothesized principles through observations. The purposes are different: one is to develop explanations, and the other is to test the validity of the explanations.
Meaning of research - Research Methodology - Manu Melwin Joymanumelwin
Research in common parlance refers to a search for knowledge. Once can also define research as a scientific and systematic search for pertinent information on a specific topic. In fact, research is an art of scientific investigation.
Research is a systematic inquiry to describe, explain, predict and control the observed phenomenon. Research involves inductive and deductive methods (Babbie, 1998). Inductive methods analyze the observed phenomenon and identify the general principles, structures, or processes underlying the phenomenon observed; deductive methods verify the hypothesized principles through observations. The purposes are different: one is to develop explanations, and the other is to test the validity of the explanations.
This document is highly important for the learners of research methodology. A number of statistical terminologies are defined with examples for the simplicity of learners.
TYPES OF RESEARCH _ DIFFERENT TYPES OF RESEARCH.pdfMatiullahjan3
What is fundamental research?
What is applied research?
What is action research?
What is Qualitative Research?
What is Descriptive Research?
What is Correlation Research?
What is Experimental Research?
What is Quasi Experimental research?
What is Quantitative Research?
What is Historical Research?
What is Ethnographic Research?
What is Phenomenological Research?
What is Narrative Research?
What is Exploratory research?
What is Explanatory Research?
What is Case study research?
What is Survey Research?
perfect negative correlation
perfect positive correlation
an independent variable
dependent variable
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Note 1 : RESEARCH METHODOLOGY
1. NOTE 1: RESEARCH METHODOLOGY
KEY CONCEPTS OF THE SCIENTIFIC METHOD
There are several important aspects to research methodology. This is
a summary of the key concepts in scientific research and an attempt
to erase some common misconceptions in science.
Steps of the scientific method are shaped like an hourglass - starting
from general questions, narrowing down to focus on one specific
aspect and designing research where we can observe and analyze this
aspect. At last, we conclude and generalize to the real world.
VARIABLES
A variable is something that changes. It changes according to different factors. Some variables
changes easily, like the stock-exchange value, while other variables are almost constant, like the
name of someone. Researchers are often seeking to measure variables.
The variable can be a number, a name or anything where the value can change.
An example of a variable is temperature. The temperature varies according to other variable and
factors. You can measure different temperature inside and outside. If it is a sunny day, chances
are that the temperature will be higher than if it's cloudy. Another thing that can make the
temperature change is whether something has been done to manipulate the temperature, like
lighting a fire in the chimney.
In research, you typically define variables according to what you're measuring. The independent
variable is the variable which the researcher would like to measure (the cause), while the
dependent variable is the effect (or assumed effect), dependent on the independent variable.
These variables are often stated in experimental research, in a hypothesis, e.g. "what is the effect
of personality on helping behavior?"
In explorative research methodology, e.g. in some qualitative research, the independent and the
dependent variables might not be identified beforehand. They might not be stated because the
researcher does not have a clear idea yet on what is really going on.
Confounding variables are variables with a significant effect on the dependent variable that the
researcher failed to control or eliminate - sometimes because the researcher is not aware of the
effect of the confounding variable. The key is to identify possible confounding variables and
somehow try to eliminate or control them.
FORMULATING THE RESEARCH PROBLEM
2. Researchers organize their research by formulating and defining a research problem. This helps
them focus the research process so that they can draw conclusions reflecting the real world in the
best possible way.
HYPOTHESIS
In research, a hypothesis is a suggested explanation of a phenomenon.
A null hypothesis is a hypothesis which a researcher tries to disprove. Normally, the null
hypothesis represents the current view/explanation of an aspect of the world that the researcher
wants to challenge.
Research methodology involves the researcher providing an alternative hypothesis, a research
hypothesis, as an alternate way to explain the phenomenon.
The researcher tests the hypothesis to disprove the null hypothesis, not because he/she loves the
research hypothesis, but because it would mean coming closer to finding an answer to a specific
problem. The research hypothesis is often based on observations that evoke suspicion that the
null hypothesis is not always correct.
In the Stanley Milgram Experiment, the a null hypothesis was that the personality determined
whether a person would hurt another person, while the research hypothesis was that the role,
instructions and orders were much more important in determining whether people would hurt
others.
OPERATIONALIZATION
Operationalization is to take a fuzzy concept, such as 'helping behavior', and try to measure it by
specific observations, e.g. how likely are people to help a stranger with problems.
See also:
Conceptual Variables
VALIDITY AND RELIABILITY
Validity refers to what degree the research reflects the given research problem.
Types of validity:
• External Validity
• Population Validity
• Ecological Validity
• Internal Validity
• Content Validity
• Face Validity
3. • Construct Validity
• Convergent and Discriminant Validity
• Test Validity
• Criterion Validity
• Concurrent Validity
• Predictive Validity
Reliability refers to how consistent a set of measurements are. Reliability may be defined as
"Yielding the same or compatible results in different clinical experiments or statistical trials" (the
free dictionary). Research methodology lacking reliability cannot be trusted. Replication studies
are a way to test reliability.
Types of Reliability:
• Test-Retest Reliability
• Interrater Reliability
• Internal Consistency Reliability
• Instrument Reliability
• Statistical Reliability
• Reproducability
Both validity and reliability are important aspects of the research methodology to get better
explanations of the world.
GENERALIZATION
Generalization is to which extent the research and the conclusions of the research apply to the
real world. It is not always so that good research will reflect the real world, since we can only
measure a small portion of the population at a time.
CHOOSING THE RESEARCH METHOD
The selection of the research method is crucial for what conclusions you can make about a
phenomenon. It affects what you can say about the cause and factors influencing the
phenomenon.
It is also important to choose a research method which is within the limits of what the researcher
can do. Time, money, feasibility, ethics and availability to measure the phenomenon correctly
are examples of issues constraining the research.
CHOOSING THE MEASUREMENT
Choosing the scientific measurements are also crucial for getting the correct conclusion. Some
measurements might not reflect the real world, because they do not measure the phenomenon as
it should.
4. SIGNIFICANCE TEST
To test a hypothesis, quantitative research uses significance tests to determine which hypothesis
is right.
The significance test can show whether the null hypothesis is more likely correct than the
research hypothesis. Research methodology in a number of areas like social sciences depends
heavily on significance test.
A significance test may even drive the research process in a whole new direction, based on the
findings.
The t-test (also called the Student's T-Test) is one of many statistical significance tests, which
compares two supposedly equal sets of data to see if they really are alike or not. The t-test helps
the researcher conclude whether a hypothesis is supported or not.
DRAWING CONCLUSIONS
Drawing a conclusion is based on several factors of the research process, not just because the
researcher got the expected result. It has to be based on the validity and reliability of the
measurement, how good the measurement was to reflect the real world and what more could
have affected the results.
The observations are often referred to as 'empirical evidence' and the logic/thinking leads to the
conclusions. Anyone should be able to check the observation and logic, to see if they also reach
the same conclusions.
Errors of the observations may stem from measurement-problems, misinterpretations, unlikely
random events etc.
A common logical error for beginners, is to think that correlation implies a causal relationship.
This is not necessarily true.
ERRORS IN RESEARCH
Logically, there are possible to make two types of errors when drawing conclusions in research:
Type 1 error is when we accept the research hypothesis when the null hypothesis is in fact
correct.
Type 2 error is when we reject the research hypothesis even if the null hypothesis is wrong
Read more: http://www.experiment-resources.com/research-methodology.html#ixzz0qY9MSren