What is the standard deviation of the predictor variable

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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 heart attack values (criterion variable) from a small sample of participants are depicted below (Values below are valid for this question only!)

Stress Score Risk of Heart Attack (Higher values = more stress) (Higher values = greater risk)

6 8
7 6
4 4
1 2

What is the standard deviation of the predictor variable?

Reference no: EM132849134

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