In an industrial experiment, the yield of the process was studied under seven different levels of reactant concentrations. However, only four of the processes can be run in a day so a symmetric BIBD with four replicates was used. The table below shows the responses in percentage yields of the process. Write down the model for this design, analyze the responses, and decide whether the processes are significantly different. Use α=5%. 

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Process Shifts I II III IV V VI VII 1234567 70 79 77 79 72 53 44 61 65 55 64 64 51 55 40 53 73 54 43 43 44 40 44 52 44 188 75 63 69