A sample of 15 graduates from Eastern University showed that the mean time until they received their first job promotion was 5.2 years with a sample standard deviation of 1.4 years. A sample of 12 graduates from Midwestern University showed a sample mean of 6.7 years with a sample standard deviation of 1.1 years. Can it at the 0.01 level of significance be concluded that graduates from Eastern University received their first job promotion in significantly less time than graduates from Midwestern University?
What is the null hypothesis for this problem?
Select one:
a. Ho: mu1 > mu2
b. Ho: m1 < m2
c. Ho: mu1 = mu2