A poll reports that the mean score on a standardized test for students at a school is 81, with a margin of error of 2. If only this information is known, which is the most appropriate conclusion?
It is plausible that the actual mean score for all students is between 79 and 83.
The lowest score in the school is 79.
The mean score for all students is exactly 81.
No student scored higher than 83.
