12.6 Optional: Deciding which test to use
This question is optional; for example, if you need more practice, or you are studying for the exam.
(Answers are available in Sect. A.12)
This question has a video solution in the online book, so you can hear and see the solution.
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?