Your company, which specializes in bovine costumery (BullFeathers), has the following demand function:

Q = a + bP + cM + dR

where Q is the quantity demanded of BullFeathers' most popular bird costume for cows, P is the price of that product, M is consumer income, and R is the price of a related product.The regression results are:

Adjusted R Square 0.8105 Independent Variables Coefficients Standard Error t Stat P-value Intercept 9823.57 90.93 108.03 1.37E-42 P -4.859 2.096 -2.319 0.027 M 0.006 0.002 3.844 0.001 R 5.21 1.167 4.463 0.000