Question
Extraneous and confounded variables
Answer :
Word Count : 762
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In psychological research, the primary objective is to establish a clear and accurate relationship between the independent variable and the dependent variable. However, this relationship may be influenced by variables that are not part of the study's main focus. These are known as extraneous variables and confounded variables. Understanding and controlling these variables is essential for ensuring the validity, reliability, and accuracy of research findings. An extraneous variable is any variable other than the independent variable that may influence the dependent variable. It is not the variable of interest, but if left uncontrolled, it can affect the outcome of the experiment. Extraneous variables introduce unwanted variation into the data, making it difficult to determine whether observed changes in the dependent variable are actually caused by the independent variable. These variables can arise from participants, the environment, the researcher, or the experimental procedure. Participant variables are common extraneous variables. Differences in age, gender, intelligence, motivation, personality, health, emotional state, prior experience, and cultural background can influence responses. For example, in a study examining the effect of sleep deprivation on memory, participants with naturally superior memory abilities may perform better regardless of sleep condition. Unless these differences are controlled, they may distort the results. Environmental variables include factors such as temperature, lighting, noise, time of day, seating arrangements, and interruptions during testing. If some participants are tested in a quiet room while others are tested in a noisy environment, performance differences may reflect environmental conditions rather than the independent variable. Researcher-related variables may also influence outcomes. The experimenter's expectations, tone of voice, facial expressions, or behavior can unintentionally affect participants' responses. This phenomenon is known as the experimenter expectancy effect. Similarly, participants may alter
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