Question 617184
(a) construct a scatter plot of the paired scores. use anxiety as the X variable.
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<a href = "http://theo.x10hosting.com/2012/jun023.jpg" target = "_blank">GRAPH FOR CORRELATION STUDY</a>
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b. describe the relationship shown in the graph
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fairly scattered distribution with a general downward trend indicating that the higher anxiety level of the student corresponds with a generally lower score on the test.
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c. Assuming the relationship is linear, compute the value of Pearson r.
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R = -.5870264049
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d. determine the least-squares regression line for predicting the final exam score, given the anxiety level. should b(y) be positive or negative? why?
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y = -1.5156x + 127.02
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e. draw the least-squares regression line of part (d) on the scatter plot of part (a)
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see the graph.
the regression line is already there.
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f. based on the data of the 10 students, if a student has an anxiety score of 38, what value would you predict for her final exam score? round to two decimals.
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an anxiety level of 38 predicts a score of about 69.
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g. calculate the standard error of estimate for predicting for her final scores from anxiety scores. clinical, health, education
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standard error of estimate is equal to 15.18962
<a href = "http://theo.x10hosting.com/2012/jun024.jpg" target = "_blank">EXCEL WORKSHEET SHOWING STATISTICAL MEASURES FOR CORRELATION STUDY</a>
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reference:
<a href = "http://www.okstate.edu/ag/agedcm4h/academic/aged5980a/5980/newpage24.htm" target = "_blank">http://www.okstate.edu/ag/agedcm4h/academic/aged5980a/5980/newpage24.htm</a>