=+54. Suppose not only that the two population or treatment response distributions are normal but also that

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=+54. Suppose not only that the two population or treatment response distributions are normal but also that they have equal variances. Let 2 denote the common variance. This variance can be estimated by a “pooled” (i.e., combined) sample variance as follows:

s 2

p 5 a n1 2 1 n1 1 n2 2 2 bs 2

1 1 a n2 2 1 n1 1 n2 2 2 bs 2

2

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Applied Statistics For Engineers And Scientists

ISBN: 9781133111368

3rd Edition

Authors: Jay L. Devore, Nicholas R. Farnum, Jimmy A. Doi

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