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Hypothesis and Research QuestionsFoundations of Nursing Research

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A predicted relationship between two or more variables...
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Hypothesis
Hypothesis should always be written ________ a study and never _________ after the study results are examined.
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Before the study and never changed once the results are examined.
What are the purposes of a hypothesis?
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-They lend objectivity to scietific investigations by pinpointing a specific part of a theory to be tested. -Theoretical positions can be tested in the real world -can support or fail, but always lends to scientific knowledge -guides research design and statistical analysis tools -provide's a reader with the researcher's expectations about the study before it begins
What are the three characteristics of a True Experiment?
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1) Manipulation of the experimental variable (IDV) 2) A minimum of one experimental and one comparison group 3) Random assignment of subjects
ROX stands for...
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R-Randomization O-Observation X-treatment/intervention
RO1XO2>E means... RO1 O2
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A randomized study with a pretest/preobservation (O1) and intervention/treatment (X), a post-test/postobservation (O2) experimental design.
Where can the source or rationale for a hypothesis come from?
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Personal experience, previous research studies, literature, or from other theories.
What are the general classifications of hypotheses?
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Simple, Complex, Research hypothesis or Null Hypothesis. Research hyotheses can be furthered classified into nondirectional or directional hypotheses.
A ________ hypothesis involves the relationship between one independent and one dependent variable.
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Simple
The variable considered the "cause..."
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Independent
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The variable considered the "effect...."
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Dependent
The variable considered the "reason a phenomenon occurs..."
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Independent variable
The variable considered, "the phenomenon"
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Dependent
How are independent and dependent variables identified in nonexperimental studies?
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By examining the directional influence of one variable on another, or by which variable occurred first
A _______ hypothesis involves the study of two or more independent variables, two or more dependent variables or both within the same study
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Complex
  
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