Members of 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 produced the results given in the table below. At the .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?
|
Females
|
Males
|
|
Sample size
|
20
|
18
|
|
Sample mean
|
3.8
|
2.5
|
|
Sample variance
|
3.5
|
2.2
|
A. No, because the test value 2.38 is greater than the critical value
B. No, because the test value 2.38 does not exceed the critical value
C. No, because the test value 2.90 is greater than the critical value
D. Yes, because the test value 2.90 is greater than the critical value