Finding Critical Values In constructing confidence intervals for s or s2, Table A-4 can be used to

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Finding Critical Values In constructing confidence intervals for s or s2, Table A-4 can be used to find the critical values x2 L and x2 R only for select values of n up to 101, so the number of degrees of freedom is 100 or smaller. For larger numbers of degrees of freedom, we can approximate x2 L and x2 R by usingimage text in transcribed

where k is the number of degrees of freedom and za>2 is the critical z score described in Section 7-1. Use this approximation to find the 95% critical values x2 L and x2 R for the acupuncture treatment group in Exercise 16 “Acupuncture for Migraines” where n = 142.

How do the results compare to the actual critical values of x2 L = 110.020 and x2 R = 175.765?

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Biostatistics For The Biological And Health Sciences

ISBN: 9780134039015

2nd Edition

Authors: Marc Triola, Mario Triola, Jason Roy

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