\fFILLABLE VERSION a. Determine the regression equation. (Negative amounts should be indicated by a minus sign. Do not round intermediate calculations. Round final answers to 2 decimal places.) X Y ( 14 12 376.36 14 21.4 20 16 )2 ( )2 ( 1376.41 )( ) 719.74 47.1 13.4 179.56 30 31.1 443.54 967.21 46 12.6 357.21 23 10.4 967.21 48 90 28.9 213.16 421.94 50 85 23.9 275.56 396.74 55 50 = sy 466.56 110.0 16.6 48.9 = = 3469.21 sx = r = b= a = Y' = + X b. Determine the estimated sales if 40 contacts are made.(Do not round intermediate calculations. Round final answers to 2 decimal places.) 1,272.24 Contacts 14 12 20 16 46 23 48 50 55 50 Sales 24 14 28 30 80 30 90 85 120 110