The marketing department of a company has designed three different boxes for its product. It wants to determine which box will produce the largest amount of sales. Each box will be test marketed in five different stores for a period of a month. Information on sales is provided below.

Store $1$ Store $2$ Store $3$ Store $4$ Store $5$

Box $1210230190180190$

Box $2195170200190193$

Box $3295275290275265$ What is the treatments sum of sqaure? Can you please show me the calculation steps, but not on the excel? Thanks a lot