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Pearson's r (Ch. 15) - Problem #2 Study Description Bellow are data from a correlational study exploring the relationship between anxiety level and test performance. A total of n = 5 students participated. The participants are asked to come to the laboratory 15 minutes before the final exam. For each participant, the psychologist records a physiological measure of anxiety. In addition, the psychologist obtains the exam score for each participant. Conduct a Pearson's r, with alpha set at 0.05 (two-tails), to determine if there is a relationship between anxiety level and test performance. Table Person Anxiety (X) X Exam Grades (Y) XY 80 74 76 w w 74 EX= EX-= EY = EXY = _ Scatter Plot 71 72 73 74 75 76 77 78 79 80 81 2 3 5 6 7 X Pearsons r . SP = EXY _ EXEr . SS, = EX? _ (Ex . SS. = TY? _ Cre Critical Value of r . Critical Value (Table B.6 p. 709) df = n - 2 Conclusion