Ononot — A researcher surveys two schools: - School A: nA = 100 stude

Guest Session: 1 Question Remaining. Create Account to save progress.

Descriptive Statisticsmedium

0:00.0

A researcher surveys two schools:

School A: $n_A = 100$ students, variance = $s_A^2 = 25$ cm²

School B: $n_B = 200$ students, variance = $s_B^2 = 36$ cm²

The pooled variance formula is: $s_p^2 = \frac{(n_A - 1)s_A^2 + (n_B - 1)s_B^2}{n_A + n_B - 2}$

What is the combined variance?