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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Q. What is a potential disadvantage of a within-subjects experimental design?

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Q. How can the issue of transfer of learning effects be mitigated in a within-subjects experimental design?

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Q. What is a mixed design in experimental research?

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Q. Why is the choice of a statistical test important in experimental analysis?

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Q. What is the purpose of looking at the data before conducting statistical tests in an experiment?

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Q. Why is saving the original data important in experimental analysis?

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Q. What distinguishes a discrete variable from a continuous variable?

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