Question: Recommendation letters for professors. Refer to the American Psychologist (July 1995) study of applications for university positions in experimental psychology, Exercise 2.58 (p. 64). One of the objectives of the analysis was to identify problems and errors (e.g., not sub- mitting at least three letters of recommendation) in the application packages. In a sample of 148 applications for the positions, 30 applicants failed to provide any letters of recommendation. Estimate, with 90% confidence, the true fraction of applicants for a university position in experimental psychology that fail to pro- vide letters of recommendation. Interpret the result.

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