Question: Use linear regression to develop a predictive model for the demand for iPhone cases based on the sales of iPhones. Please Show excel formulas it's

Use linear regression to develop a predictive model for the demand for iPhone cases based on the sales of iPhones. Please Show excel formulas it's where I'm getting stuck.

Month iPhone Sales Demand
Jan 8 2

Feb

 11 2
march 9 5
April 11 9
may 8 5
June 10 4
July 12 8
Aug 9 4
Sept 7 3
Oct 7 2
Nov 10 6
Dec 8 2

a) Develop the equation (show all your work).

b) What is the coefficient of correlation for this data?

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