Name of the Method Reviewed
Between-Subjects Experimental Method
Primary Use of the Method
The Between-Subjects Experimental Method is one of the commonly used experimental design methods by researchers. It involves assigning the subjects of an experiment to different conditions whereby every subject experiences only one of the various experimental conditions being studied to test one or more variables (Hajcak, Meyer & Kotov, 2017). The Between-Subjects Experimental Method needs both a treatment and control condition. The selected subjects of the experiment are randomly assigned to either of these two conditions to determine how they respond to the variables being tested.
When it should be Used
Between-Subjects Experimental Method should be used in any study that aims at identifying whether one treatment is better than the other. This design is also applicable when the researcher is working with multiple experimental groups that have been assigned different variables that are being compared (Robinson et al., 2016). Whereas the experimental groups are assigned independent variables that significantly affect the results of the research or study, the control group used by the researcher does not get any treatment of the variables being tested.
Strengths
The main strengths of the Between-Subjects Experimental Method include:
It is increasingly easier to set up, especially when multiple independent variables need to be tested.
Secondly, Vatavu and Wobbrock (2016) assert that this research design has a high degree of internal validity since it has fewer threats.
Prevents the risk of carryover effects since the participants only participate in a single condition (Vatavu & Wobbrock, 2016)
Reduces the duration that is needed by the researcher for the study to be completed
Limitations
Below are the main weaknesses that are associated with the between-subjects Experimental Method:
A high number of participants are required to ensure that the much-needed statistical power is achieved.
The study’s validity is under significant threat due to the possibility of significant individual differences amongst the participants (Infantolino et al., 2018).
Infantolino et al. (2018) contend that the researcher must gather numerous resources to ensure that the study is completed.
Ethical Considerations
Various ethical considerations are associated with the use of Between-Subjects Experimental Method during research:
Firstly, the researcher who intends to use this research design must seek the consent of the participants before starting the study (Robinson et al., 2016).
The second ethical consideration is maintaining and respecting the anonymity and confidentiality of the participants before, during, and after the study (Robinson et al., 2016).
Thirdly, the researcher needs to mask the study by ensuring that none of the participants feel discriminated against. This may alter their responses in the conditions they have been placed in, thus influencing the accuracy of the outcomes obtained (Robinson et al., 2016).
Example of when the Method could be Used
The Between-Subjects Experimental Method can be used in numerous instances to test certain variables. For instance, a researcher wishing to examine whether displaying a new slogan (independent variable of the study) can increase the number of sign-ups on a website newsletter (dependent variable of the study) may use the Between-Subjects Experimental Method. In this case, the researcher can use a sample size of 138 participants who are then divided into two groups, that is, a control group that comprises of participants who see the current business slogan on the website and the experimental group that consists of respondents who see the new business slogan on the website. Through using the Between-Subjects Experimental Method, the researcher can then conduct statistical analysis to compare the percentage of newsletter sign-ups between these two groups of participants under study.
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