Incomplete Block Designs

The following is a BIBD with parameters $v = 4, b = 4, k = 3, r = 3, \lambda = 2$:

Block 4 contains:

A varietal trial on Wheat crop was conducted using a two-associate Partially Balanced Incomplete Block Design (PBIBD) with parameters $v = b = 9; r = k = 3; \lambda_1 = 1; \lambda_2 = 0; n_1 = 6; n_2 = 2$. In such a two-association scheme, the values of $p_{jk}^i$ written as matrices $P^1$ and $P^2$ are:

Consider the following Lattice design using ee ee, ee ee ee as the standard array with s=3 a ee eee eee ee po ee ee ee ee, a, a a ee ee po a a Consider the following statements: