SCENARIO 10-15 The Table Below Presents the Summary Statistics for the Starting

SCENARIO 10-15
The table below presents the summary statistics for the starting annual salaries (in thousands of dollars) for individuals entering the public accounting and financial planning professions.
Sample I (public accounting) :

Test whether the mean starting annual salaries for individuals entering the public accounting professions is higher than that of financial planning assuming that the two population variances are the same.
-Referring to Scenario 10-15,what additional assumption is needed for the test to be valid?

A) The two sample sizes have to be equal.
B) The two population sizes have to be equal.
C) The two population means have to be the same.
D) The population distributions of the two annual salaries have to be normal.