1.25 Communication skills, both written and oral, remain key to professional success within the engineering profession. Bonk, Imhoff, and Cheng (J. Professional Issues in Engineering Education and Practice, 2002) studied effects of pooled efforts between engineering, business, and English departments.

a The mean evaluation scores for the fourth-year capstone course in structural engineering during the fall 2000 and spring 2001 semesters were 4.0 and 4.2. During the fall and spring

semesters, respectively, 30 and 33 students completed the evaluations. Determine the composite mean evaluation score for the entire academic year.
b During the spring 2001 semester, the mean scores (number of responses) in writing, environmental, transportation, structural, and civil engineering, respectively, were reported to be 4.2(30), 2.7(29), 3.0(29), 4.2(30), and 3.0(30). The numbers in the parenthesis are the sample sizes. Determine the mean score for the spring semester of 2001.

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U.S. Population in 1890 and 2010 (projected) Age 1890 2010 0-9 24% 10-19 20-29 30-39 40-49 50-59 60-69 70+ 13.2% 22% 13.9% 18% 13.5% 9.5% 6.5% 4% 3% 13.7% 12.7% 14.2% 13.7% 9.5% 9.2% Source: U.S. Census Bureau, National Population and Projections Summary Tables, January 2000 (http://www.census.gov/)