6.48 Lung Cancer Compilation of large masses of data on lung cancer shows that approximately 1 of every 40 adults acquires the disease. Workers in a certain occupation are known to work in an air-polluted environment that may cause an increased rate of lung cancer. A random sample of n = 400 workers shows 19 with identifiable cases of lung cancer. Do the data pro- vide sufficient evidence to indicate a higher rate of lung cancer for these workers than for the national average?