state two characteristics of experiment
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Characteristics of true experimental design Manipulation – control of independent variable by the researcher through treatment/ intervention Control – the use of control group and extraneous variables on the dependent variable Randomization – every subject gets equal chance being assigned to experimental.
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Explanation:1.
Randomization - After developing a sampling approach, a researcher is required to randomly assign individuals to the different study groups in order to eliminate bias of individual differences in all study groups. Randomization lets you create homogenous treatment groups without involving potential judgements or bias. While randomly assigning participants, all participants have equal probability of being in a given condition. Here the participants are assigned to group receiving treatment (experimental group) or group with doesn’t require any kind of treatment (control group). The added benefit of this feature is that it neutralizes factors other than the independent & dependent variables.
2.Control over extraneous variables - The ‘control’ concept plays a vital role in experimental design. Random assignment results in concern of controlling extraneous variables (factors that affect the cause and effect relationship). While conducting the study, it is a must for scholars to control the differences between the groups via matching of group members, random assignment or statistical control of differences. However, while controlling the variables, the scholar must make sure that the treatment is administered in a similar way in each attempt. Upon the completion of the experiment, both the treatment group and control group should be assessed to identify the existence of differences between them.