6.90 The Associated Press (San Luis Obispo Telegram-

Tribune, August 23, 1995) reported on the results of mass screening of schoolchildren for tuberculosis

(TB). For Santa Clara County, California, the proportion of all tested kindergartners who were found to have TB was .0006. The corresponding proportion for recent immigrants (thought to be a high-risk group) was .0075. Suppose that a Santa Clara County kindergartner is selected at random. Are the events selected student is a recent immigrant and selected student has TB independent or dependent events?
Justify your answer using the given information.