Recently, a team of urban archaeologists uncovered a journal kept by an elderly woman who lived in Charleston in the late eighteenth century. In the volume, the woman expressed her fear that she was being haunted by a ghost. She described in exhaustive detail the nature of the hauntings, systematically recording the time and duration of over 100 encounters with the apparition. The archaeologists, impressed by the scientific rigor present in this unprecedented find, concluded that the ghosts must exist.
Which one of the following represents the conclusion that can be most reasonably drawn from the information in the passage above?