If surgical procedure A has a higher success rate than surgical procedure B in every hospital where they are used and yet procedure B has a higher overall success rate, then we suspect that A)this is nonsense and it can’t possibly be true. B)this is an example of Simpson’s paradox. C)it must be easier to achieve success at some hospitals than at others, whatever procedure is used. D)procedure B must be used predominantly in hospitals where it is easier to achieve success, while procedure A must be used predominantly where it is harder to achieve success. E)all of (b), (c), and (d) are true.

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MATLAB: An Introduction with Applications

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If surgical procedure A has a higher success rate than surgical procedure B in every hospital where they are used and yet procedure B has a higher overall success rate, then we suspect that
	A)	this is nonsense and it can’t possibly be true.
	B)	this is an example of Simpson’s paradox.
	C)	it must be easier to achieve success at some hospitals than at others, whatever procedure is used.
	D)	procedure B must be used predominantly in hospitals where it is easier to achieve success, while procedure A must be used predominantly where it is harder to achieve success.
	E)	all of (b), (c), and (d) are true.