M5-9 estimating cost behavior using least-squares regression refer to the tan-o-rama data in m5-7. suppose sherri performed a least-squares regression and obtained the following results: page 227 put sherri’s results into a linear equation format (y = a + bx) and explain what each component means. compare the regression results to those obtained in m5-7 and m5-8. which method is most accurate? why? lo 5-5 m5-10 calculating unit contribution margin and contribution margin ratio refer to the tan-o-rama regression output given in m5-9. suppose that the company charges $6 per tanning session. calculate the unit contribution margin and contribution margin ratio as well as the total contribution margin if the shop books 400 tanning sessions this month.