Does least squares fitting require determining the vertical shift?

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theBEAST
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Homework Statement


Multiple-choice question on fitting 2^x to data by least squares, with options a through f giving deviation expressions; options b and d are circled in red, and d is selected.


I am not sure whether the answer should be b or d. It says the average of the function and the vertical scale need to be determined. In other words I won't have to determine a_0 (the vertical shift) right? Because it did not mention that?

Also what is the average of the function? Why do you need the average?

Thanks!
 
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