Okay, So this problem says that children whose parents refused to participate in the randomized controlled trial got polio at a range of 46 per 100,000. But children whose parents consented to participation got polio at a slightly higher rate of 49 per 100,000. And this this'll holding was repeated the next year. And based on this data, some parents refused to have other children to participate in experiments because they didn't want the children to be exposed to a higher risk of polio. And the question is asking, Are these currents right or not? And they want a brief explanation. So these prints are not right, because, uh, they aren't taking into account the certain confounding variable. And that variable is a family income. On the surface, it may seem like those who participate in the trial, um, get polio at a slightly higher rate. Um, but you if you dig into it and actually think about it, um, those who participate ah, 10 the a lot of them will probably need the money for the probably A lot of them are participating just for the money, and they need more money. So they probably have like your lower family income, and thus they have less access to medical care. So in actuality, it's not the it's not the trial. It's not. The experiment that's causing polio is just the type of people who are choosing Thio participate in the experiment because they need the money. These types of people tend to be more on the slightly more poor. And fellas, they're more like Mi Teoh. Get polio just because they don't have as much access to metal cure medical care. It's not actually a few minutes. All sincerely, it might just be because the type of people who consent participation are just poor. They have last medical care and are thus get polio at a higher rate.