homework_5

# homework_5 - performance a Fill in the table with all of...

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PSC 103B Statistical Analysis of Psychological Data Homework #5 Due: 2/21/2008 1. For a 2 4 . ANOVA, answer the following questions: (2 points) a. Is it a one-way or two-way ANOVA? b. How many factors there? c. How many levels for each factor? d. How many cells in total? 2. Students often worry that the scheduled time of their final exam will affect their performance. You suspect that this might be true and that the effect would be greatest for more difficult exams. To test this, you conduct a 2 x 3 factorial ANOVA experiment in which difficulty level and time of testing are varied for a sample of 24 students who are taking final exams at different times. Using the data below, test whether performance depends on time of day and difficulty level of the exam. Higher scores indicate better

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Unformatted text preview: performance. a. Fill in the table with all of the cell means. (2 points) 9am 12pm 3pm row means Hard Easy column means b. Construct the ANOVA table below AND interpret your main effects. (4 points) Boxes with XX will be left empty. Source SS df MS F Sig. Difficulty Time Interaction Within XX XX Total XX XX XX Time of Testing 9:00am 12:00pm 3:00pm Difficulty of Test Hard 5 8 10 4 6 10 1 6 12 1 5 8 Easy 11 6 6 5 9 4 14 8 3 10 7 1 c. Now, analyze the interaction effect by examining the simple effect of Time . Fill in the ANOVA table below AND interpret this simple effect by looking at the group means (you do NOT need to use planned comparisons). (2 points) Boxes with XX will be left empty. Source SS df MS F Sig. Time at Hard Time at Easy Within XX XX...
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homework_5 - performance a Fill in the table with all of...

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