Retail Store Testing I am an analyst who is new to retail store testing (for example: customer response to a store new layout or a new product or process in one or 2 stores).  

Any suggestions for a good book/blog/any source where I could learn about this. The challenges I see are - the sample size is usually one or 2 stores for the test so how do you do statistically significant testing with such a small sample; test stores or control stores are matched 1-1 but often not selected randomly. Any guidance in learning about the data science in this area is greatly appreciated. 

Thanks!!
"The New Science of Retailing: How Analytics are Transforming the Supply", Book by Ananth Raman and Marshall Fisher has some very good information of data science applied to Retail. Although, they don't address your case directly, they do have a chapter on store level execution that might help, and another chapter on assortment planning which might have relevant information.