Another group of students interested in the same analysis took a random sample of the same size and computed a confidence interval for mean incisor length. They estimated the unknown population mean incisor length among all Rainier National Park beavers to be between 16.4 to 28.1 millimeters. Even though they took a sample of the same size, they computed a wider confidence interval. What are possible explanations for getting a wider confidence interval? Select all that apply:

A. The sample they used is inherently different.
B. They used a lower confidence level than the 95% used by the first student.
C. Since the confidence interval is larger in size, we would expect sample-to-sample variability to remain the same.
D. They used a higher confidence level than the 95% used by the first student.