B. (a) A random sample of 25 female college students and 23 male college students indicated with the following results concerning the amount of time spent in volunteer service per week. At the 02 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? Sample Mean and Sample Variance for the female students are 2.4 and 2.1 respectively and that for male students are 3.7 and 3.4 respectively.                                                                    (b) A sociologist wishes to see whether the number of years of a college person has completed is related to her or his place of residence.    A sample of 88 people is selected and classified as shown:     NO COLLEGE FOUR YEAR DEGREE ADVANCED DEGREE URBAN 15 12 8 SUBURBAN 8 15 9 RURAL 6 8 7

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