It’s purpose is to control some of the extraneous sources of variation by removing such variation from the MSE term.
Randomized Block Design
This design tends to provide a better estimate of the true error variance and leads to a more powerful hypothesis test in terms of the ability to detect difference among treatment means.
ANOVA Procedure
SST=SSTR+SSBL+SSE
SST
Sum of squares total
SSTR
Sum of squares due to blocks
SSE
Sum of squares due to error
FACTORIAL EXPERIMENT
An experimental design that allows simultaneous conclusion about 2 or more factors.