A researcher conducts a study on the average height of a certain tree species. A random sample yields a mean height of 45 feet with a margin of error of 3.5 feet. Which of the following is the most appropriate conclusion about the mean height of the entire population of this tree species?
It is exactly 45 feet.
It is between 41.5 feet and 48.5 feet.
It is less than 45 feet.
It is greater than 48.5 feet.