A correlation coefficient of 0.85 is calculated between body mass index and systolic blood pressure in a sample of 200 adults. This indicates:
- A A strong positive correlation ✓
- B A weak positive correlation
- C No meaningful relationship between the variables
- D A strong negative correlation
Correct answer: A. A strong positive correlation
Explanation
Correlation coefficients range from -1 to +1. Values between 0.7 and 0.9 are generally considered strong positive correlations. The positive sign indicates that as BMI increases, systolic blood pressure tends to increase as well. C value of 0.85 represents a strong positive linear relationship between the two variables.
Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.
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