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Example of an Experiment: Lighting and Worker Productivity
An example of an experimental design involves manipulating room lighting to examine its effects on workers' productivity. In this scenario, the lighting conditions (bright versus dim lights) represent the independent variable, while the workers' productivity is the measured dependent variable. If loud noise is present only when the lights are bright, that noise becomes a confounding variable because it varies systematically with the lighting, providing an alternative explanation for any productivity changes. However, if the noise is present equally under both lighting conditions, it is merely an extraneous variable that does not disrupt the ability to make causal conclusions about the lighting.
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Research Methods in Psychology - 4th American Edition @ KPU
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Types of Experimental Research
Basic Experimental Design Components
Interpreting Experimental Findings in Psychology
Reporting Research in Psychology
Weakness of Experimental Research: Artificial Settings
Ethical Constraints in Experimental Research
The Core Aim of Experimental Research
Primary Strength of Experimental Research: Establishing Causality
A researcher wants to test if a new note-taking strategy improves exam performance. They teach the new strategy to their morning class and the traditional strategy to their afternoon class. At the end of the unit, the morning class scores significantly higher on the exam. The researcher concludes that the new strategy causes better exam performance. Which of the following statements best analyzes the validity of this conclusion?
Falsifiability
Example of an Experiment: Lighting and Worker Productivity
Field Experiment
Experiment
Inability to Manipulate Variables
Experimental Record Keeping
Non-Experimental Research
Quasi-Experimental Research
Comparison of Internal Validity Across Research Designs
Applications of Surveys
Laboratory Experiment
Single-Subject Research
Match each component of experimental research with its specific role or function in the study design.
A researcher wants to know whether a new memorization strategy causes higher quiz scores. She recruits 50 participants and allows each person to choose whether to use the new strategy or their usual approach. She then compares the average quiz scores of the two groups. This study qualifies as an experiment because it compares two groups on a measured outcome.
In experimental research, what is the primary objective of systematically manipulating an independent variable and randomly assigning participants to conditions?
Match each core component of experimental research with its specific role in the research process.
A researcher investigating the effect of exercise on mood assigns 50 participants to a high-intensity workout group and 50 participants to a stretching group by flipping a coin for each person. True or False: Because the researcher used randomized assignment and systematically manipulated the type of exercise, this study qualifies as experimental research.
To establish a causal relationship between two variables, a researcher must strictly adhere to the logic of experimental design. Arrange the following steps in the sequence required to ensure internal validity and support a causal inference.
In the context of experimental research, which of the following best describes the fundamental goal of exercising a high degree of 'control' over variables of interest?
A researcher claims their study demonstrates that one variable directly produces a change in another, but a reviewer notices that participants were not randomly assigned to conditions. In evaluating the research design, the reviewer concludes that the lack of randomization prevents the study from supporting a(n) _____ inference.
In experimental research, the variable that the researcher systematically manipulates to observe its effects on the dependent variable is called the _____ variable.
An investigator wants to design a study to test a causal hypothesis. Evaluate the logical flow of components in experimental research by ordering these steps from the initial establishment of control to the final research objective.
Learn After
In an experiment where a researcher manipulates room lighting (bright versus dim) to examine its effect on workers' productivity, match each variable role to the correct example.
In a study testing how room lighting (bright vs. dim) affects worker productivity, a loud noise occurs only during the bright-light condition. Why is this noise considered a confounding variable?
In the 'Lighting and Worker Productivity' experiment, a researcher must analyze whether an unplanned noise is a confounding variable or an extraneous variable. Arrange the logical steps of this analysis in the correct order, from initial component identification to final classification.
In an experiment investigating the effect of lighting on worker productivity, a researcher is methodologically justified in concluding that the lighting conditions caused the observed productivity changes even if a loud noise occurred, provided that the noise was experienced equally by workers in both the bright and dim light conditions.
Imagine you are developing a new experimental protocol to study the 'Lighting and Worker Productivity' relationship. To successfully create a design where a 'loud noise' is treated as an extraneous variable rather than a confounding variable, which of the following setups should you construct?
In the experiment studying room lighting and worker productivity, if a loud noise is present equally under both the bright and dim lighting conditions, it is classified as a confounding variable.
A researcher investigates whether room lighting (bright vs. dim) influences the number of tasks workers complete. If the researcher provides free coffee to the workers only during the 'bright light' condition, the presence of coffee is a(n) _____ variable.
A researcher replicates the lighting and worker productivity experiment in a new factory setting. Match each described scenario to the correct variable role it represents in the experiment.
In a replication of the lighting and worker productivity experiment, a researcher discovers mid-study that a supervisor provided verbal encouragement to workers exclusively during the bright-light condition and remained silent during the dim-light condition. Analyzing why this threatens the study's conclusions: the verbal encouragement must be classified as a _____ variable, because it changes in lockstep with the lighting manipulation and cannot be ruled out as an alternative cause of any observed productivity difference.
A research team wants to evaluate whether their lighting-and-worker-productivity design supports a valid causal conclusion before they publish. Arrange the following evaluation steps in the correct logical order.