An experiment designed to study the relationship between hypertension and cigarette smoking yielded the following...

Under the null hypothesis of the independence of hypertension and smoking status, we have the following expected table (rounding off the expected frequencies)
$\begin{array}{|cccc|}\hline Tensionlevel& Non-smoker& Moderatesmoker& Heavysmoker\\ Hypertension& 33& 31& 22\\ Nohypertension& 37& 34& 24\\ \hline\end{array}$
This gives the value of T to be 16.486, which, under the null, follows an asymptotic chi-squared distribution, with 2 degrees of freedom. This yields a p value of 0.00026, and hence we reject the null hypothesis.