Question

If we define as $s=\sqrt{MSE}$of which parameter is $s$an estimate.

Short answer

$s$is the pooled estimate of population standard deviation.

Step-by-step solution

Given Information

Given in the question that $s=\sqrt{MSE}$.

We have to find the use of parameter$s$.

Explanation 

Let's consider the equation $s=\sqrt{MSE}$

In this case, $s$is the pooled estimate of population standard deviation.

It is also the weighted average of each group's standard deviation.

Pooled variance is a process used to estimate the variance of multiple populations.