29. There is a negative association between heart attacks and amount of hair. Guys with lots of hair are less likely to have heart attacks than bald guys (less hair, more heart attacks). But of course getting older is the real cause because old guys have less hair and more heart attacks than young guys. What idea does this example illustrate? A Women don't go bald. B Heart attacks cause baldness. C Both variables result from a common cause D The association is a coincidence E Baldness causes heart attacks. 30. A magazine wanted to know how honest the people in their city were - so the set up a random telephone survey of 1000 people and asked them, "had they stolen anything in the last year". The result was that 2% said they had stolen something in the last year. The most likely reason that this survey is unreliable is. A. The sample size was too small. B The question was phrased badly. C. There is a good chance that many of those who replied will lie. D. A telephone sample is likely to be biased