Q. What is a key advantage of field observation over laboratory studies in usability evaluation?

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Q. In the context of field observation, what is the "Heisenberg uncertainty principle" referring to?

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Q. When might laboratory testing be more suitable than field observation for usability evaluation?

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Q. What should be considered when deciding between field studies and laboratory studies for usability evaluation?

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Q. What is one of the key advantages of using a controlled experiment for evaluating a design or aspect of a design?

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Q. In the context of experimental evaluation, what role do experimental conditions play?

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Q. What is the importance of choosing participants closely matching the expected user population in experimental evaluation?

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Q. According to Nielsen and Landauer, how many participants are recommended for usability testing to uncover usability problems?

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Q. What factor determines the appropriate sample size for a controlled experiment in usability evaluation?

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Q. In an experimental evaluation, what is the purpose of independent variables?

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Q. What is a level of an independent variable in an experimental study?

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Q. What is the role of dependent variables in an experimental evaluation?

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Q. If an experiment investigates the impact of both font size and color on user reading speed, how many independent variables are there?

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Q. What characteristic must a dependent variable possess in an experiment?

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Q. What is a hypothesis in an experimental evaluation?

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Q. What is the purpose of the null hypothesis in an experiment?

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Q. In experimental design, what is the role of the control condition?

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Q. What is a between-subjects experimental design?

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Q. What is an important consideration when choosing participants for an experiment?

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Q. In a between-subjects experimental design, why is each participant exposed to only one experimental condition?

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