A study has 6 participants in the experimental group and 16 participants in the control group. What is the harmonic mean of these sample sizes?
A)6.3
B)8.7
C)9.2
D)10.01

Question

Quizplus · Accepted Answer

The harmonic mean of two numbers, $a$ and $b$, is given by the formula $\frac{2ab}{a+b}$. Applying this formula to the given sample sizes, we have $\frac{2 \times 6 \times 16}{6 + 16} = \frac{192}{22} = 8.7272$, which rounds to 8.7.

A Study Has 6 Participants in the Experimental Group and 16