Please answer the following questions after carefully reading the paper: P. Falcoz, C. Binquet, F. Clement, D. Kaili, C.

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Please answer the following questions after carefully readingthe paper: P. Falcoz, C. Binquet, F. Clement, D. Kaili, C. Quantin,S. Chocron and J. Etievent (2003) “Management of the second episodeof spontaneous Pneumothorax: a decision analysis,” Annals ofThoracic Surgery, Vol. 76, pp. 1843–8 a) What kind of model wasdeveloped? What was the aim(s) of the model? b) Describe brieflythe possible decision alternatives and outcomes. c) Using asuitable package such as Precision Tree, draw, for this problem, adecision tree such as the one in Figure 1, including all parameters(baseline values). d) Determine the expected cost and effectivenessof each decision alternative. Use the tree drawn in c) and show allworking. Compare your results with those in Table 2. e) Study: •The effect of mean length for Conservative Management (CM) onexpected cost • The two-way effects of mean length of stay for CMand VATS on expected cost • The two-way effects of mean length ofstay for CM and VATS on ICER (Incremental Cost Effectiveness Ratio)Comment on your results, in particular on: - how they compare withthose in the paper - the usefulness of sensitivity analysis indecision analysis.