week 4.docx - Topic 1 A research experiment contains...

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Topic 1 A research experiment contains different types of variables that the researcher is interested about. The independent variable is the variable the experimenter changes or controls and is assumed to have a direct effect on the dependent variable. There is also the dependent variable which is the variable being tested and measured in an experiment, and is 'dependent' on the independent variable. However, some other variables may come up that the researcher did not have in mind. These variables are known as extraneous variables since they are those that present themselves in an experiment apart from the independent and dependent variables that the researcher is aware of. There is a challenge when you have extraneous variables in your experiment as they can make your research difficult by introducing errors, hence the need to control the possibility of intrusion of such extraneous factors into your experiment. To control an extraneous variable the researcher needs to begin by identifying those variables that are most likely to influence the dependent variable (Psychology World, n.d.). The researcher may identify the variables by

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