What is the degree of freedom (sd) in the analysis of a 4-by-5-dimensional table that...

Step 1
The degrees of freedom can be calculated by subtracting the number of relations from the number of observations. determining the degrees of freedom for a sample mean or average, you need to subtract one (1) from the number of observations, n.
Step 2
${\displaystyle 4\times 5dimensional=20datasets}$
${\displaystyle \text{degree of freedom}=n-1=20-1=19}$
Option c is correct.