=+A.9 An experiment was conducted to investigate whether a graphologist (handwriting analyst) could distinguish a normal person’s handwriting from the handwriting of a psychotic. A well-known expert was given 10 files, each containing handwriting samples from a normal person and from a person diagnosed as psychotic. The graphologist was then asked to identify the psychotic’s handwriting.

The graphologist made correct identifications in 6 of the tics in the Real World, by ew York: Macmillan, cate that the graphologist handwriting of psy-

bability of correctly guess-

Your answer should depend on whether this probability is relatively small or relatively large.)