Interpreting the Results of Pearson’s

• What was the main focus of the investigation into anxiety?

  Relationship between drug duration and heart rate
• How was heart rate measured in the study?

  Before and after taking anti-anxiety drugs
• What was the correlation measured in the study?

  Length of time on drugs and heart rate reduction
• What does a directional hypothesis indicate in this study?

  It predicts the direction of the relationship
• What is the calculated value of r in this study?

  0.740
• How many pairs of scores were used in the study?

  10
• What is the critical value of r at the 5% level for a one-tailed test with N=10?

  0.497
• What does it mean if the calculated value is greater than the critical value?

  Findings are significant at the 5% level
• What conclusion can be drawn from rejecting the null hypothesis?

  There is a significant correlation present
• What type of correlation was found between drug duration and heart rate reduction?

  Significant negative correlation
• What are the critical values of r for a one-tailed test at different levels of significance?

  • 0.05 level: 0.497 (N=10)
  • 0.025 level: 0.576 (N=10)
• What are the critical values of r for a two-tailed test at N=10?

  • 0.10 level: 0.231
  • 0.05 level: 0.195