Volunteer Work of College Students Females and males alike from the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students indicated these results concerning the amount of time spent in volunteer service per week. At the 0.01 level of significance, is there sufficient evidence to conclude that a difference exists between the mean number of volunteer hours per week for male and female college students?

Male Female

Sample mean 2.5 3.8

Sample variance 2.2 3.5

Sample size 18 20

Source: New York Times Almanac.

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