Recommendation letters for professors. Refer to the American Psychologist (July 1995) stud...

Recommendation letters for professors. Refer to the American Psychologist (July 1995) study of 148 applicants for a position in experimental psychology, presented in Exercise 2.62 (p. 59). Recall that the mean number of recommendation letters included in each application packet was The standard deviation was also reported in the article; its value was s = 1.48.

a. Sketch the relative frequency distribution for the number of recommendation letters included in each application for the experimental psychology position. (Assume that the distribution is mound shaped and relatively symmetric.)

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b. Locate an interval on the distribution found in part a that captures approximately 95% of the measurements in the sample.

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c. Locate an interval on the distribution found in part a that captures almost all the sample measurements.

Exercise 2.62

Recommendation letters for professors. Applicants for an academic position (e.g., assistant professor) at a college or university are usually required to submit at least three letters of recommendation. A study of 14c8 applicants for an entry-level position in experimental psychology at the University of Alaska at Anchorage revealed that many did not meet the three-letter requirement. (American Psychologist, July 1995.) Summary statistics for the number of recommendation letters in each application are as follows:

Mean = 2.28 Median = 3 Mode = 3 Interpret these summary measures.