Does cover color make sales?

I have a kindle that was black on the top and bottom with a picture in the middle. Last month according to Novelrank I sold 3 copies of this book . Last week I change the colors to white with red text. Today I sold 10 copies and checking again I just sold one more so 11 just today. That's using Novelrank so we'll see. My sales ranking is now #2 in short reads/sports and outdoors beating out a Muhammed Ali book which is at number 3. So does it make a difference?


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