For several months, a shoe store owner collects data on the number of children in a group (c) and the total amount of the purchase, in dollars (d). she finds that there is a positive linear association between d and c that is best modeled by the equation d=16.3c+37 . which statement is true? a) the model predicts that for each additional child in a group, the total amount of purchase increases by $16.30. b) the model predicts that for each additional child in a group, the total amount of purchase increases by $37.00. c) the model predicts that the average total amount of purchase for a group is $37.00. d) the model predicts that the average total amount of purchase for a group is $16.30.