## 12.6Optional: 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 . 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?

### References

Singh RK, Prasad G. Long-term mortality after lower-limb amputation. Prosthetics and Orthotics International. 2016;40(5).