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used might affect the moodver al towne runs the example. likely lead to more home runs. It was decided to include an additional variable, namely 10 if before 1976 (that is the Spaulding baseball was used) Manufacturer " ifafter 1076 (that is the Rawlings basedball was used) A multiple regression analysis was performed using the model: HAVE home runs per game per team " Bo * Bj(Year) + By(Manufacturer) The following results were obtained: Analysis of Variance Source Sum of Squares Model 0.744384 Error 2.539330 Parameter Estimates Variable Parameter Standard Error Estimate Intercept -27.91180 12.8900 H M Year 0.014977 0.00650 Manufacturer 1 -0. 107816 0.11573 Reference: Ref 11-2 R2 m