The Internal Revenue Service Wishes to Study the Time Required

Multiple Choice

The Internal Revenue Service wishes to study the time required to process tax returns in three regional centers. A random sample of three tax returns is chosen from each of three centers. The time (in days) required to process each return is recorded as shown below. $$\begin{array} { | c | c | c | } \hline \text { East } & \text { West } & \text { Midwest } \\\hline 49 & 47 & 54 \\39 & 52 & 49 \\45 & 51 & 56 \\\hline\end{array}$$ The test to use to compare the means for all three groups would require:

A) three-factor ANOVA.
B) one-factor ANOVA.
C) repeated two-sample test of means.
D) two-factor ANOVA with replication.