Q. What is the primary difference between parametric and non-parametric tests?

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Q. When might a contingency table be used in an experiment?

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Q. Which type of analysis is used to provide a range of values within which a parameter is likely to fall?

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Q. What is the null hypothesis in an experiment?

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Q. What is the primary purpose of experimental design?

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Q. What is the main advantage of using naturalistic images for icons in an interface design experiment?

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Q. In the context of the icon design experiment, what are the dependent variables?

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Q. What does a within-subjects experimental design involve?

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Q. What is the advantage of using a within-subjects experimental design in the icon design experiment?

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Q. What is the purpose of providing participants with a fixed amount of time to learn the icon meanings before the selection task?

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Q. Which factor does the independent variable represent in the icon design experiment?

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Q. In the icon design experiment, what are the main dependent variables being measured?

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Q. Why is a within-subjects design chosen for the icon design experiment?

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Q. What is the purpose of varying the placement of icons within the blocks on each presentation?

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Q. What statistical test is used to analyze the differences between completion times for natural and abstract icons?

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Q. Why is the standard error of the difference (s.e.d.) calculated in the analysis of the results?

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Q. What is one of the challenges when conducting experimental studies involving groups compared to single-user experiments?

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Q. Why might arranging suitable time slots for group experiments be challenging?

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Q. What factor influences the choice of experimental tasks for group studies of groupware systems?

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Q. What kind of tasks are often used in group experiments to encourage active cooperation and consensus-building?

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