What type of hypothesis is the following? "Normal saline flush with heparin is more effective than normal saline flush alone in maintaining patency of an intermittent intravenous site."
a. Complex, causal
b. Complex, nondirectional
c. Simple, directional
d. Simple, null
ANS: C
A simple hypothesis states the relationship (associative or causal) between two variables. In this example, the variables are normal saline flush (one independent variable) and patency of an intermittent intravenous site (one dependent variable). A directional hypothesis states the nature of the interaction between two or more variables. In this example, the direction is indicated by the prediction "more effective."
There are just two variables involved; complex means more than that, and there is no causal relationship indicated. The feasibility of a research problem and purpose is determined by examining the researcher's expertise; money commitment; availability of subjects, facilities, and equipment; and the study's ethical considerations.
There are just two variables involved; complex means more than that, and there is a direction (more effective) indicated. The feasibility of a research problem and purpose is determined by examining the researcher's expertise; money commitment; availability of subjects, facilities, and equipment; and the study's ethical considerations.
The null hypothesis is the statistical hypothesis that there will be no difference. The feasibility of a research problem and purpose is determined by examining the researcher's expertise; money commitment; availability of subjects, facilities, and equipment; and the study's ethical considerations.
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