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Question Completion Status > Moving to another question will save this response Question 1 of 19 Question 1 2 points Saved A nurse is interested in whether there is a relationship between daily levels of stress and likelihood of a heart attack The stress scores (predictor variable) and risk of heant for th s question on! attack values criterion variable from a small sample of participants are depicted below Stress Score (Higher values more stress) (Higher values greater rišk) Values below are val Risk of Heart Attack 4. What is the covariance? Question 1 of 19 A Moving to another question will save this response. 5:18 PM 17/2013 Type here to search

Explanation / Answer

from above covariance =Sxy/(n-1) =4/(4-1) =4/3 =1.3333

S.No X Y (x-x)2 (y-y)2 (x-x)(y-y) 1 5.000 3.00 0.0000 6.2500 0.0000 2 5.000 9.00 0.0000 12.2500 0.0000 3 4.000 3.00 1.0000 6.2500 2.5000 4 6.000 7.00 1.0000 2.2500 1.5000 Total 20 22 2.0000 27.0000 4.0000 Mean 5.0000 5.5000 SSX SSY SXY

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