Undergraduate pre-requisite: QSTBA 221. Formerly QSTQM 222. Students must choose either QSTBA 222 or QSTBA 223 (formerly QM222). Students cannot take both BA222 and BA223. - This course examines the use of economic and statistical tools for making business decisions. The course emphasizes linking data analysis to spreadsheet modeling to support advanced business decision making. Topics include multiple regression, causal inference, forecasting, demand modeling, and optimization. Case studies apply concepts to practical business problems and the principal software tool used in the course is the spreadsheet. Effective Fall 2025, this course fulfills a single unit in the following BU Hub area: Quantitative Reasoning II.