. In a recent survey of people aged 50-71 in the United States, during a follow-up period the annual probability of lung cancer occurrence was about 0.00023 for people who had never smoked and about 0.01284 for current smokers who smoked more than two packs per day. (a) Find and interpret the relevant difference in proportions. (b) Find and interpret the relevant relative risk. (c) Which measure would you say is more informative, and why? (d) For a different type of cancer, the relative risk for smokers vs. non-smokers is 3.10. Can we say this is a concerning increase in risk from a practical point of view? Explain why or why not.