The Two Samples Whose Statistics Are Given in the Table $$\begin{array} { | c | c | c | } \hline n & \text { Mean } & \text { SD } \\\hline 50 & 22 & 3 \\\hline 55 & 25 & 4 \\\hline\end{array}$$

Multiple Choice

The two samples whose statistics are given in the table thought to come from populations with
Equal variances. What is the pooled estimate of the population standard deviation? $$\begin{array} { | c | c | c | } \hline n & \text { Mean } & \text { SD } \\\hline 50 & 22 & 3 \\\hline 55 & 25 & 4 \\\hline\end{array}$$

A) 3.50
B) 1.87
C) 5.00
D) 3.56
E) 3.52