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Suppose VATS procedures should be recommended for 25% surgeries, but historical data suggests they are used for only 20%. Using new data, your study will assess whether or not VATS rates have changed.

(a) A sample of size n = 54 recent lobectomy patients is easily available. What is the power of a 2-sided test based on only these patients?

(b) How large a sample is necessary for your study to achieve 90% power using a 2-sided test?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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