Q5. Investigators conduct a study to estimate the true (i.e., population) mean length of time (in hours) between exposure to a virus and appearance of symptoms. In a sample of 49 people who have been exposed to the virus, the sample mean number of hours until appearance of symptoms is 72 hours (sample standard deviation 28 hours). Based on these results, the investigators report: "We are 99% confident that the true average time between exposure to the virus and appearance of symptoms is between 61.3 and 82.7 hours". If the researchers had, based on the same sample results, presented a 95% confidence interval, which of the following would be true: A. The 95% confidence interval would have been narrower than the 99% confidence interval B. The margin of error of the 95% confidence interval would have been smaller than the margin of error of the 99% confidence interval. C. The standard error of the sample mean used in the 95% confidence interval would have been smaller than the standard error of the 99% confidence interval. D. A and B E. A and B and C