The variation around the line, i.e. the error term, should be the same everywhere (we also assumethe errortermfollows a normal distribution).

ii.The mean values of the response variable for different values of the explanatory variable should fallona straightline.

Howwelldoyouthink thisdatasetmeetstheassumptionsabove?

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Revenue ($) 50 45 40 35 30 25 20 15 10 0 5 D Paws For Effect Monthly Sales Data 2 4 6 8 10 12 14 16 18 20 20 Month 22 23 24 24 . y= 0.8138x + 17.853 26 28 30 32 32 34 Revenue ($) 50 45 40 35 30 25 20 15 10 0 5 D Paws For Effect Monthly Sales Data 2 4 6 8 10 12 14 16 18 20 20 Month 22 23 24 24 . y= 0.8138x + 17.853 26 28 30 32 32 34