SKIDMORE PS 217 - PS 217 Exam 2 (4 pages)

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PS 217 Exam 2



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PS 217 Exam 2

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Pages:
4
School:
Skidmore College
Course:
Ps 217 - Statistical Methods in Psychology I

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ID Exam 2 PS 217 Fall 2008 As always the Skidmore Honor Code is in effect At the end of the exam I have a sheet on which you will attest to your adherence to the Honor Code Read each question carefully and answer completely showing all your work Good Luck 1 Suppose that you are interested in whether the type of mood reflected by a word happy neutral or sad affects how well the word is remembered You construct a list of 10 happy words e g joyful bright 10 neutral words e g derive convey and 10 sad words e g gloomy lonely You present the list repeatedly to 8 participants until they can recite the entire list correctly twice in a row You repeat this procedure for each word list for a total of 24 participants One week later each participant attempts to recall the entire list The number of items correctly recalled the DV is seen below as a function of the type of word the IV Analyze the results of this experiment as completely as possible including whatever interpretation seems appropriate 20 pts Happy 5 6 4 5 3 6 2 5 36 4 5 14 T X Mean SS Source SS Neutral 4 3 5 3 1 3 2 3 24 3 0 10 df Page 1 of 4 Sad 3 4 2 1 2 4 3 1 20 2 5 10 G 80 X2 318 MS F 2 Suppose that you were interested in computing an ANOVA on 3 sets of data from 30 different people for which summary statistics are shown below 5 pts Mean Variance s2 n Condition 1 15 5 10 Condition 2 20 15 10 Condition 3 40 70 10 a What parameter is MSWithin intended to estimate b In the ANOVA computed on the data above what would MSWithin be c What FCrit would you use to evaluate the FObt for the overall ANOVA d If the three means had been identical e g 15 15 15 what would FObt be e If the same study were conducted as a repeated measures design how many total participants would you need to produce at least as many pieces of data i e at least 30 as seen above 3 People like Jacob Cohen suggest that we should conduct experiments with power of at least 80 What level of Type II error are they willing to tolerate 2 pts 4 Briefly



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