So this is the hypothesis. It's often called the null hypothesis or H₀. Null is kind of a funny word but that's what people commonly call it. And there's a contrary hypothesis that evaluates this hypothesis– we'll just call it the alternate hypothesis or H₁. So on the right side, I'm going to write examples for what this hypothesis could mean in this case. So here are five different choices and if you listen carefully, can you tell me which of these five choices and there's exactly one would correspond to the null hypothesis that this medication works exactly as advertised where p is the probability of losing weight.