breast.fed bottle.fed 20 18 11 35 3 7 24 182 7 6 28 33 58 223 7 7 39 57 17 76 17 186 12 29 52 39 14 15 12 21 30 28 7 8 15 27 65 77 10 12 7 8 19 16 34 28 25 20 5. A common symptom of otitis-media (inflammation of the middle ear) in young children is the pro- longed presence of fluid in the middle ear, called middle-ear effusion. It is hypothesized that breast-fed babies tend to have less prolonged effusions than do bottle-fed babies. Researchers presented the re- sults of a study of 24 pairs of infants who where matched according to sex, socioeconomic status, and type of medication taken. One member of each pair was bottle-fed and the other was breast-fed. The file ears on Blackboard gives the durations (in days) of middle-ear effusions after the first episode of otitis-media. (a) Examine the data using graphical methods and summarize your conclusions. (b) In order to test the hypothesis of no difference, do you think it is more appropriate to use a para- metric or a nonparametric test? (c) Carry out a test. What do you conclude?