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Exam 8: Complex Designs

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Question 1

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The number of conditions in a complex design described as a 2 * 3 is

A) two.
B) three.
C) five.
D) six.

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Question 2

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Briefly describe the analysis that are done to interpret the results of complex designs when an interaction effect is present and when an interaction effect is not present.

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When an interaction effect is present,si...

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Question 3

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Which of the following patterns indicates that there has been no interaction effect in a complex design experiment when the results are plotted in a line graph?

In a line graph of a complex design,the dependent variable is typically represented

A researcher was interested in the effects of arousal and personality on individuals' GRE test performance.The personality variable he examined was individuals' level of introversion-extraversion.Based on questionnaire responses,each participant was classified as an "extravert" or an "introvert." The researcher manipulated arousal level by giving caffeine to participants prior to administering a practice GRE test.Participants were randomly assigned to a high-caffeine condition,a medium-caffeine condition,or the no-caffeine condition.All participants then completed a version of the quantitative portion of the GRE. Suppose the researcher observed the following means for each group: Describe the design of this experiment ,including the type of variables used,and identify the conditions created using factorial combination.

A common approach for resolving contradictory findings in research literature is to develop a theory for the source of different findings and

In order to interpret the findings of a complex design experiment,researchers

.The two independent variables are speed of the presentation (250 msec,1000 msec) and brightness of the background (dark,light) .Speed of presentation is a repeated measures variable,and brightness of the background is a random groups variable.Suppose the following mean were observed.What should the researcher conclude?

The three potential sources of systematic variation in a complex design experiment involving two independent variables include

A student has conducted an experiment involving a 4 * 2 design.The student's initial analyses of variance indicates there was no statistically significant interaction effect in the experiment.The independent variable with four levels,however,did produce a statistically significant main effect.Which of the following analyses should the student do next to specify the source of this main effect more precisely?

A researcher did an experiment testing the effects of noise on students' ability to study effectively in different environments.The design was a 3 * 2,with three levels of background noise and two different environments.The researcher obtained an interaction effect and decided to try to identify the source of the interaction effect by testing the effect of the noise variable separately at each level of the environment variable.Which of the following types of effects in the analysis of a complex design was the researcher testing?

When no interaction effect occurs in a complex design with two independent variables,we know the effects of each independent variable can be generalized

In a 2 * 2 complex design,one independent variable was shown not to have a statistically significant main effect on the dependent variable.Based on this,we can state that

.He is also interested in knowing whether high or low test-anxious individuals' performance is different for the computerized version of the two tests compared to the paper-and-pencil version of the tests.Within each anxiety group,he randomly assigns participants to either the computer version or the paper version of the GRE tests.Participants then complete both the verbal and quantitative tests of the GRE in the test version they've been assigned (computer or paper).Thus,each participant has two scores,a Verbal score and a Quantitative score. What kind of complex design is this ?

A researcher was interested in the effects of arousal and personality on individuals' GRE test performance.The personality variable he examined was individuals' level of introversion-extraversion.Based on questionnaire responses,each participant was classified as an "extravert" or an "introvert." The researcher manipulated arousal level by giving caffeine to participants prior to administering a practice GRE test.Participants were randomly assigned to a high-caffeine condition,a medium-caffeine condition,or the no-caffeine condition.All participants then completed a version of the quantitative portion of the GRE. Suppose the researcher observed the following means for each group: The researcher claims that the Arousal and Group variables in this experiment are not relevant independent variables.State whether you agree or disagree with this statement,and explain your reasoning.

Which of the following statements best describes the effects that occurred in the 2 * 2 design outlined in the following table? The dependent variable is memory for the tasks (out of a possible ten) ,and you may assume that any nonzero difference is statistically significant.

In a complex design experiment,researchers found that younger and older people performed equally well on a memory task when they were tested in the afternoon,but the older people performed better than the younger people when they were tested in the morning.The different effect of age at the two times of day represents

Which of the following effects occurs in a complex design when the effect of one independent variable differs depending on the level of a second independent variable?

.He is also interested in knowing whether high or low test-anxious individuals' performance is different for the computerized version of the two tests compared to the paper-and-pencil version of the tests.Within each anxiety group,he randomly assigns participants to either the computer version or the paper version of the GRE tests.Participants then complete both the verbal and quantitative tests of the GRE in the test version they've been assigned (computer or paper).Thus,each participant has two scores,a Verbal score and a Quantitative score. What is the natural groups variable in this study? What are the levels?

Which of the following statements is false?