Question:

Students graduating from the University were followed for a period of 5 years after their final exams, with the aim of investigating the waiting time to get a first job. Censored observations are indicated with an asterix (*).

		Time in months
Rural	Male	4	5	6*	6	7	7
	Female	6	7	8	11*	12
Urban	Male	2	4	4*	5	6
	Female	2	5	5	6	7*	9

1. Why would it not make sense to compare the survivor functions for male and female within each strata to make conclusions about gender differences? [5 marks]
2. Distinguish between exact survival data and grouped survival data, explaining the main strengths and drawbacks of each. [5 marks]