At the beginning of the semester, a professor hypothesizes that half of the class would think the pace of the class was just right. After collecting anonymous survey data from a random sample of the class, it was observed that 27% of the class though the pace was just right. What is the appropriate null hypothesis to determine if the true proportion of students who thought the pace was just right differs from the hypothesized value? O HO: p=0.5 O HO: p^hat=0.27 O HO: p^hat = 0.5 O HO: p=0.27