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Although it sounds convincing, I'm not so sure that the test was scientific and statistically valid. They need more variation and repeatability.

Apparently, they had one day for "small" breast, one day for medium and one day for large.

What days of the week were they? Maybe they did the large breast on a Saturday when people are more relaxed and willing to tip more? Maybe small was on a Monday, when people are more depressed?

Maybe it was just natural fluctuation, and the big just happened to get the most....if they had done it again, they could very well had the small breast situation get the same as the large, but the medium get the least? Maybe on the day the large breast was used, there was a porno convention in town? And horny guys were aplenty. That's an exaggeration, but you get the point. There are many reasons that may cause the 3 situations to be not equal to each other, other than her breast appearance. Maybe when she sported the larger breast, she truly felt more confident, and the coffee house patrons responded to that, and that alone and not to the breasts.

Need more repeated tests where all test conditions between the 3 situations were randomized and done over and over again to get a truly valid statistical result.
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