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1
Good research question?
 Feasible
 Subjects
 Resources
 Manageable
 Data available?
 Interesting
 Novel
 In relation to previous
findings
 Confirm or refute?
 New setting, new
population
 Ethical
 Social or scientific value
 Safe
 Relevant
 Advance scientific
knowledge?
 Influence clinical practice?
 Impact health policy?
 Guide future research?
2
A Research Question Must
Identify
1. The variables under study
2. The population being studied
3. The testability of the question
3
Variables in research
 Have 2 or more properties or qualities
 Age, sex, weight, height
 Is one variable related to another?
 “ Is X related to Y? What is the effect of X on Y?” etc.
4
Variables in research
 Independent
variable:
 has a presumed effect
on the dependent
variable (outcome)
 May or may not be
manipulated
 Dependent variable:
 Something that varies
with a change in the
independent variable
 Outcome variable
5
Hypothesis
 Statement about the relationship
between 2 or more variables
 Converts the question into a statement
that predicts an expected outcome
 A unit or subset of the research
problem
6
Characteristics of hypotheses
 Declarative statement that identifies the
predicted relationship between 2 or
more variables
 Testability
 Based on sound scientific
theory/rationale
7
Directional vs. Non-Directional
Hypotheses
 Directional hypothesis
Specifies the direction of the relationship
between independent and dependent
variables
 Non-directional hypothesis
Shows the existence of a relationship
between variables but no direction is specified

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Research questions.ppt

  • 1. 1 Good research question?  Feasible  Subjects  Resources  Manageable  Data available?  Interesting  Novel  In relation to previous findings  Confirm or refute?  New setting, new population  Ethical  Social or scientific value  Safe  Relevant  Advance scientific knowledge?  Influence clinical practice?  Impact health policy?  Guide future research?
  • 2. 2 A Research Question Must Identify 1. The variables under study 2. The population being studied 3. The testability of the question
  • 3. 3 Variables in research  Have 2 or more properties or qualities  Age, sex, weight, height  Is one variable related to another?  “ Is X related to Y? What is the effect of X on Y?” etc.
  • 4. 4 Variables in research  Independent variable:  has a presumed effect on the dependent variable (outcome)  May or may not be manipulated  Dependent variable:  Something that varies with a change in the independent variable  Outcome variable
  • 5. 5 Hypothesis  Statement about the relationship between 2 or more variables  Converts the question into a statement that predicts an expected outcome  A unit or subset of the research problem
  • 6. 6 Characteristics of hypotheses  Declarative statement that identifies the predicted relationship between 2 or more variables  Testability  Based on sound scientific theory/rationale
  • 7. 7 Directional vs. Non-Directional Hypotheses  Directional hypothesis Specifies the direction of the relationship between independent and dependent variables  Non-directional hypothesis Shows the existence of a relationship between variables but no direction is specified