Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs?

Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? Let x be the magnitude of an earthquake (on the Richter scale), and let y be the depth (in kilometers) of the quake below the surface at the epicenter. 

) Use a calculator to verify that Σx = 24.3, Σx2 = 88.55, Σy = 53.7, Σy2 = 457.65 and Σxy = 193.57.

Compute r. (Round to 3 decimal places.)

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