variables and hypotheses - wikieducatorvariables •a relationship is a statement about variables. a...
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Variables and Hypotheses
The keys to studying relationships.
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Relationships
Descriptive studies allow us to better understand questions of what, where, when, and sometimes how. They don’t help us answer questions of why, however. To understand why things occur, we need to look at patterns of behavior and events, and delve into how different factors interact with one another.
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Variables
• A relationship is a statement about variables.
A variable is a concept and refers to the
variation found within a class of objects.
Height, weight, age, education level, hair
color, the type of automobile one drives,
number of hours of sleep one requires, are all
variables.
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Constants
• Characteristics that do not vary are known as
constants. Examples of constants my be
gender, when members of only one sex are
studied; people attending one school as
opposed to subjects from different schools;
only left-handed people; only people of
Japanese ancestry.
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Different types of variables
• Quantitative variables
• Categorical variables
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Quantitative Variables
• Exist on a continuum of “less” to “more”.
• Examples would be age, height, weight,
income, net worth, level of formal education,
level of interest in a topic, frequency of church
attendance, air temperature.
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Categorical variables
• These variables do not vary in degree, amount,
or quantity, but are qualitatively different.
Examples are eye color, gender, religious
preference, occupation, hobbies.
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Categorical variables
• Most research “treatments” or “methods” are
also classified as categorical variables. For
example, if a researcher were to study ways
teachers teach reading, the variable used would
be “reading methods”.
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Quantitative or categorical variable?
1. Make of automobile
2. Learning ability
3. Ethnicity
4. Cohesiveness
5. Heartbeat rate
6. Gender
7. Brand of shoyu
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Studying relationships
• Researchers often look at relationships
between or among two or more:
–Quantitative variables
–One categorical and one quantitative
variable
–Two or more categorical variables
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Two quantitative variables
• Age and amount of interest in school
• Reading achievement v. math achievement
• Classroom climate and student motivation
• Amount of time watching television and
aggressive behavior
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One categorical and one quantitative variable
• Method used to teach reading and reading
achievement
• Counseling approach and level of anxiety
• Nationality and liking of school
• Student gender and amount of attention given
by teachers.
• Student gender and amount of praise given by
teachers
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Two categorical variables
Ethnicity and father’s occupation
Gender of student and college major
Administrative style and subject or grade level
taught
Religious affiliation and political party
membership
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Which are these?
• Ethnicity and rate of skin cancer
• Level of exercise and incidence of heart
disease
• Type of books read and membership in a book
club
• Graduation rate and socio-economic status
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Collapsing variables
A researcher might treat a variable, such as
income, as a categorical rather than a
quantitative variable. Instead of looking at
graduated income levels, income might be
classified as “high” and “medium” or
“medium” and “low”. This can pose some
problems.
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Collapsing variables: Problems
• First, income is generally considered on a continuum among people, not an either/or.
• Second, collapsing the variable ignores many differences and limits the possibility of looking at more detailed nuances in the information
• Third, the dividing line among the groups is almost always arbitrary, opening the door for criticism of the rationale for the decision.
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Independent and dependent variables
• Independent variables are those that the
researcher chooses to study in order to
examine their effect on one or more other
variables.
• Dependent variables are the variables that the
independent variables are presumed to affect.
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Can you identify the variables?
Will students of teachers who graduated with a
subject area major in addition to elementary
education have higher test scores than students
of education majors?
Independent variable:
Dependent variable:
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Conditions of the independent and dependent variables
• Independent: Teachers with subject area major
and teachers with only an education major.
• Dependent: Performance on tests
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Independent variables: Manipulated
Independent variables may be manipulated or
selected. A manipulated variable is one that
the researcher creates. These variables are
most often used in experimental studies where,
in order to study differing effects, the
researcher alters the treatment in the study.
Manipulated variables are also known as
treatment variables or experimental variables.
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Independent variables: Selected
In education studies, primarily for ethical and
human subject reasons, independent variables
are identified and selected. That is, conditions
that already exist are used in the study, as
opposed to creating new ones or altering
existing ones.
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Outcome variables
• In studies with a categorical independent variable, the term “outcome variable” is used to describe the dependent variable that is affected. It is generally quantitative. For example, if a researcher were to study the question “Will students like history more if taught by the inquiry method than by the case study method?”, the outcome variable would be “liking of history”, a quantitative variable.
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Extraneous variables
• These are independent variables that have not
been controlled in a study. Yet, they represent
factors that may affect the outcome, thus must
be accounted for in any study. One way is to
hold them constant. Another is to limit the
parameter of the study.
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Hypotheses
A hypothesis is a prediction regarding the
possible outcome of a study.
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Question/Hypothesis
• Question: Will students who are taught history
by a teacher of the same gender like the
subject more than students taught by a teacher
of the opposite gender?
• Hypothesis: Students taught history by a
teacher of the same gender will like the subject
more than students taught by a teacher of the
opposite gender.
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Question/Hypothesis
• Question: Is rapport with clients different with counselors using client-centered therapy than with those using behavior-modification therapy?
• Hypothesis: Counselors who use client-centered therapy with have a greater rapport with their clients than those who use a behavior-modification approach.
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Advantages of using hypotheses
Forces us to think about outcomes
Philosophy of science
Helps us see relationships
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Disadvantages of hypotheses
• Bias (toward outcome)
• Unnecessary or inappropriate
• May unwittingly limit study
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Significance
• This is a statistical term that relates to
information that may lead to more useful
knowledge.
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Directional v. non-directional hypotheses
• Directional hypotheses identifies a specific
direction (more, less, higher, lower) in a
relationship, whereas non-directional
hypotheses do not.
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Ethics
• This simply refers to questions of right and
wrong. It is a very important consideration in
research. The University has an Institutional
Review Board, and any study involving human
subjects must be approved by that board.
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Definition of ethics
• Webster’s New World Dictionary defines
ethical behavior as “conforming to the
standards of conduct of a given profession or
group”.
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Ethical Studies
• On pp. 56-57 of our text, there is a detailed list
of ethical considerations and expectations as
outlined by the American Psychological
Association’s Committee on Scientific and
Professional Ethics.
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Protect subjects from harm
• It is of utmost importance that researchers not
only not cause harm to their subjects, but that
they protect them from harm. If this means
aborting a study before its conclusion, this
must be done.
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Confidentiality
• Confidentiality must be honored in all studies.
This means keeping data secure, not discussing
confidential information with anyone who
does not have a legitimate reason to have it,
and removing as many identifiers as possible
to protect participants’ anonymity.
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Deception
• Whenever possible, a researcher should try not
to deceive participants in a study.
• If deception is necessary, it must not harm the
participant.
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Research with children
• Parental approval must be obtained for research with minors.
• Researchers must not present themselves as diagnosticians or counselors to parents, nor do they report information given to them in confidence.
• No coercion to participate must occur.
• Any form of remuneration does not affect theses conditions.
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