1. A surgeon wants to compare the number of successful skin grafts in a series o

Question

1. A surgeon wants to compare the number of successful skin grafts in a series of burn patients with the numbers published in other burn patients. A literature survey indicates that approximately 36.3% of burn patients with skin grafts become infected and that 77% of burn patients survive. The surgeon has had 15 patients out of 16 patients with skin grafts survive, with two infections.

a) Again, assume our sample reflects what is in the literature survey (i.e. the survival rate is 77%), what is the probability of having 15 patients survive out of 16?

b) How many survivals out of 16 would you have expected to see if the survival rate was 77%?

c) Do you think the surgeon is doing better or worse than the surgeons in the published survey?

Explanation / Answer

a) 15/16 = 0.9375

b) If the survival rate was 0.77 out of 16 patients we woud get 0.77 X 16 = 12.32 ~ 12 patients survive

c) The surgeon has a survival ratio of 93.75% which is better than the published survey

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