The monthly production amounts and total production costs of a production department for the last eight months are as shown in the table. a) Arrange the scatterplot. b) The "double average technique" is the relationship between monthly production quantities and total production cost. The monthly production amounts and total production costs of a production department for the last eight months are as shown in the table. a) Arrange the scatterplot. b) The "double average technique" is the relationship between monthly production quantities and total production cost