Facts About the F Distribution · Exercise 4

Four basketball teams took a random sample of players regarding how high each player can jump (in inches). The results are shown in.
$$\begin{array}{ccccc}\text{Team 1}& \text{Team 2}& \text{Team 3}& \text{Team 4}& \text{Team 5}\\ \text{36}& \text{32}& \text{48}& \text{38}& \text{41}\\ \text{42}& \text{35}& \text{50}& \text{44}& \text{39}\\ \text{51}& \text{38}& \text{39}& \text{46}& \text{40}\end{array}$$

What is the df(denom)?

OpenStax, Statistics · §13.3 Facts About the F Distribution · Exercise 4