Find the coefficient of correlation. What is the runoff expected for a rainfall of 20 mm?

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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3. On a small area the rainfall-runoff (P-R) observations are given below. Establish an
equation relating them by linear regression. Find the coefficient of correlation. What is
the runoff expected for a rainfall of 20 mm?

Prep (mm)   22 26 14 4 30 12
Runoff (mm) 6 12 4 0 18 6
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