My apologies! I'm a long way out from stats class now, but I've been doing some light A/B testing so I've been thinking about things from the perspective of sta

My apologies! I'm a long way out from stats class now, but I've been doing some light A/B testing so I've been thinking about things from the perspective of statistical significance rather than simple probability. So with that in mind, only having two trials, can we really determine a deviation from the norm? The odds were in his favour (slightly) but not so much that we can say with any certainty that he or his tipless restaurants were the issue. I'm rusty on the math or I'd actually calculate statistical significance (p value?) of 2 tries 1 success vs two tries 0 successes. I suspect it's below 95% though.