Research Designs
Nonexperimental Research
Cross-sectional research allows researchers to compare at least two pre-existing populations. While using this approach, independent variables are not manipulated. In addition, subjects are randomly assigned to groups. The main disadvantage of the process is the likelihood of the dependent variable’s differences due to differences other than age. They are more reliable when studying sex differences since researchers cannot accurately allocate. Hire our assignment writing services in case your assignment is devastating you.
Correlational research considers the statistical relationship between two variables without manipulating variables. This approach is interchangeably used with cross-sectional analysis. However, the two are different as the first involves comparing groups, while the latter involves comparing variables (Dehejia, 2015).
Experimental Research
Experimental designs rely on scientific data and include manipulation of variables. Accurate, practical methods involve a treatment and control group. They have manipulation of variables to test their effects on both groups. The main techniques within the category include the pretest-posttest and the posttest design. In the pretest-posttest plan, subjects are randomly allocated when grouped within the treatment and control categories. Dependent variable measurements are taken before the funding and after the treatment administration. The posttest-only design does not involve measuring dependent variables before allocating subjects to the two groups (Navarro, 2020).
Controls
When using experimental research designs, subjects are used as their controls. This type of control removes confounding effects. The main confounding impacts the power keeps in check are those belonging to each subject. Such characteristics tend to remain constant during the experiment. The nonexperimental designs do not involve specific rules, as variables are not manipulated (Overview of Nonexperimental Research, n.d). Therefore, researchers must choose the most appropriate approaches to obtain accurate results.
References
Dehejia, R. (2015). Experimental and Non-ExperimNonexperimental Development Economics: A Porous Dialectic.
Navarro, D. (2020). Experimental and Non-experimNonexperimentalOverview of NonexperimeNonexperimental(n.d). Retrieved from https://open.lib.umn.edu/psychologyresearchmethods/chapter/7-1-overview-of-nonexperimental-research/
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Question 
Research Designs
Provide examples of experimental and nonexperimenonexperimentalesign. Contrast the levels of control applied to each.