Hello everyone - I have a big problem with my statistic task

my task is

using regression analysis coment on the relationship between price and production cost (coment about the estimated coefficent (b1) , the coefficent of determination, model validity ( this is the most difficult part) and residual graph - I have some excel output data and I did something but I am not sure that I am right. - should I add hypothesis test for the slope of regression model (t test) ??Thank you for help.

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