12.6 Optional: Deciding which test to use
(Answers are available in Sect. A.12)
A study examined the mortality rates within five years of lower-limb amputation, and factors that may be associated with mortality (Singh and Prasad 2016). A summary of the data are shown in Fig. 12.2.
Which tests would have been \(t\)-tests? Which tests would have been chi-square tests? What do the \(P\)-values tell you?