Two researchers, Jaime and Mariya, are each constructing confidence intervals for the proportion of a population who is left-handed. They find the point estimate is 0.27. Each independently constructed a confidence interval based on the point estimate, but Jaime's interval has a lower bound of 0.242 and an upper bound of 0.298, while Mariya's interval has a lower bound of 0.188 and an upper bound of 0.286. Which interval is wrong? Why?