An experiment was conducted to determine whether a test designed to identify a certain form of mental illness could be easily interpreted with little psychological training. The test was given to 100 people (half of which had the illness, and half did not) and fifteen people were asked to evaluate them. The fifteen judges were five staff members of a mental hospital, five trainees at the hospital, and five undergraduate psychology majors. The results in the table give the number of the 100 tests correctly classified by each judge. Analyze the data with the Kruskal-Wallis or Friedman test statistics. Staff Trainees Students 78 80 65 76 69 74 80 75 78 79 81 80 86 72 75 a) Is there evidence to suggest that there are differences between staff, trainees, and students to interpret the test? b) Briefly write a short report of your findings
An experiment was conducted to determine whether a test designed to identify a certain form
of mental illness could be easily interpreted with little psychological training. The test was given
to 100 people (half of which had the illness, and half did not) and fifteen people were asked to
evaluate them. The fifteen judges were five staff members of a mental hospital, five trainees at
the hospital, and five undergraduate psychology majors. The results in the table give the number
of the 100 tests correctly classified by each judge. Analyze the data with the Kruskal-Wallis or
Friedman test statistics.
Staff Trainees Students
78 80 65
76 69 74
80 75 78
79 81 80
86 72 75
a) Is there evidence to suggest that there are differences between staff, trainees, and students
to interpret the test?
b) Briefly write a short report of your findings
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