methods of statistical inference are explored in Chapters 6 through 14 . Infectious Disease The data in Table 2.11 are a sample from a larger data set collected on persons discharged from a selected Pennsyivania hospital as part of a retrospective chart review of antibi- TABLE 2.11 Hospital-stay data otic usage in hospitals [7]. The data are also given in Data Set HOSPITAL.DAT with documentation in HOSPITAL.DOC on the data disk. Infectious Disease Refer to the data on hospital stays given in Table 2.11. 11.13 Find the best-fitting linear relationship between duration of hospitalization and age. 11.14 Test for the significance of this relationship. State any underlying assumptions you have used. 11.15 What is R2 for this regression