An experiment was conducted to investigate whether a
Chapter 0, Problem 7.53(choose chapter or problem)
An experiment was conducted to investigate whether a graphologist (a handwriting analyst) could distinguish a normal persons handwriting from that 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, and asked to identify the psychotics handwriting. The graphologist made correct identifications in 6 of the 10 trials (data taken from Statistics in the Real World, by R. J. Larsen and D. F. Stroup [New York: Macmillan, 1976]). Does this evidence indi-cate that the graphologist has an ability to distinguish thehandwriting of psychotics? (Hint: What is the probabilityof correctly guessing 6 or more times out of 10? Your answershould depend on whether this probability is relativelysmall or relatively large.)
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