population means

$6.(8)$ For the design matrix below, please answer the following questions, describe the resulting design, and suggest what might have happened:

This appears to be a fractional factorial design.

There are $4$ runs added for some reason.

In the first four runs, what appears to be the resolution? $q,$

What is the variable $D?q,$

What are rows $5-8$ called? $q,$

Why Would Someone Need to Use This $8-$Run Design? $|$