Price and Perception: Designer versus Knockoff Does the perceived price of a product change how much you like it? The one on the right is the designer version. Quick—how much do you like it? OK, we lied; the one on the right is the knockoff. Did your perception of it change? If researchers ask some people to rate the designer version of Ray-Ban sunglasses and other people to rate the Ray-Ban knockoff version, we could conduct an independent-samples t test to determine if the ratings are statistically significantly different.