A large software development firm recently relocated its
facilities. Top management is interested in fostering good
relations with their new local community and has encouraged their
employees to engage in local service activities. They want to
test if the firm's professionals volunteer an average of more than
15 hours per month. If this is not the case, they will institute an
incentive program to increase community involvement. A random
sample of 24 professionals reported are shown in the above table.
The average and standard deviation of volunteered hours in the
sample are 16.625 and 2.223 hours, respectively. Find the
appropriate t-statistic (t value) the company should use in order
to test if the average hours volunteered by employees at their
company is greater than 15 hours?
a. t=0.73
b. t=-3.56
c. t=3.56
d. t=0.73