TABLE 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): ₁ = 60.35, S₁ = 3.25, n₁ = 12
Sample II (financial planning): ₂ = 58.20, S₂ = 2.48, n₂ = 14
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 Table 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.

Question

TABLE 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):  ₁ = 60.35, S₁ = 3.25, n₁ = 12
Sample II (financial planning):  ₂ = 58.20, S₂ = 2.48, n₂ = 14
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 Table 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.

Quizplus · Accepted Answer

To perform a two-sample t-test assuming equal variances, the additional assumption needed is that the population distributions of the two annual salaries have to be normal.

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