7. Andie and Blane are each attempting to estimate the proportion of high school seniors who attend the senior prom. Andie selects a random sample of 150 high school seniors to survey, and she observes a sample proportion of 0.54. Blane selects a random sample of 300 high school seniors to survey, and he also observes a sample proportion of 0.54. Andie and Blane will each use their respective sample data to construct a 95% confidence interval. Who will have the narrower confidence interval? A. Andie's interval will be narrower. B. Blane's interval will be narrower. C. Both intervals will have the same width because the sample proportions are the same. D. Both intervals will have the same width because the confidence levels are the same. E. Both intervals will have the same width because the sample proportions and the confidence levels are the same for each interval.