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8 visualizing variability a researcher designs an intervention to combat...

Question: 8 visualizing variability a researcher designs an intervention to combat...

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8. Visualizing variability A researcher designs an intervention to combat anti-Arab oppression. He also designs a questionnaire to measure anti-Arab oppression so he can test the participants level of anti-Arab oppression before and after the intervention. He tests one version of his questionnaire with 45 statements and a shorter version with 12 statements. In both questionnaires, the participants respond to each statement with a rating on a 5-point Likert scale with 0 equaling strongly disagree and 4 equaling strongly agree. The overall score for each participant is the mean of his or her ratings for the different statements on the questionnaire. Look at the following graphs. Graph I graphs the results from the long version, and Graph II graphs the results from the short version. Graph I Graph II PARTICIPANTS PARTICIPANTS

LONG QUESTIONNAIRE SCORE SHORT QUESTIONNAIRE SCORE Complete The range for Graph I is The mean for Graph I is The variance for Graph I is This implies that the shorter questionnaire will be the following sentences by trusting your eyes to see meaningful differences in the two graphs. the range for Graph II. the mean for Graph II. the variance for Graph II than the longer questionnaire at detecting differences before and after the intervention.

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