Is there a statistical tool that I can use to compare ratings, such as from Amazon, for similar products from different manufacturers? Suppose I find three similar products with these ratings and the number of reviews that led to those ratings. Code: Product Rating Reviews A 4.9 3 B 4.7 48 C 4.7 628 How much confidence can I have that Product A is really better than B and, especially, C? Intuitively, the rating for C would seem to be more reliable than the one for B, which would seem to be more reliable than the one for A. Is there a statistical tool that will allow me to compute the "most likely" rating for these three products? Is there a tool that will allow me to calculate the probability that the "true" rating for A is higher than that for B or C? Is there some other tool that I don't know to ask about that will help me compare these ratings realistically?