4.9 A medical study examined the probability of making a full recovery for patients who receive a particular treatment and found that the probability was 0.866 for those over 70 years of age and 0.915 for those under 70 years of age.

a. A press release about the study stated that the odds of making a full recovery for those over 70 are 60% of the odds for those under 70. Explain how they obtained 60%.

b. An online news story that described the study stated: “Patients who are over 70 were only 60% as likely to make a full recovery as those under 70”. What is wrong with this interpretation? Explain, and provide the correct percentage for this interpretation.