In each experiment, we divide the proportions are two experimentation is compressed and experimental trials and curing concrete in a 4:3 proportion, during which time this will be an example to all examples of 72. Example
Each portion of our study was divided into two experimental trials is compression and pulling trials and curing the third time in four trial areas will have to sample all 72 samples.
In each experiment, a proportion, we 2 experiments and experimental tensile and compression curing concrete 3 time periods in which 4 this proportion will have all the examples, 72 sample For example.