Determine if the ordered pair $(18,0)$ is a solution of the system of linear inequalities $\{\begin{array}{l}3x-y>4\\ x+6y\le 9\end{array}$ .

A) not a solution
B) solution

Ten different families are tested for the number of litres of water they use each week before and after viewing a conservation video.We want to see if there is strong evidence that the conservation video changes people's water consumption rate.A t-test of the null hypothesis of no difference has a t-statistic of -2.894 with a P-value of 0.0178.Interpret this result by explaining the meaning of the P-value.