When conducting a t-test for independent samples we have 2 ways of computing the variance. One way is to compute the variance for each sample, but this only works if the samples are the same size. If the samples are different sizes, we use a different equation. What is this variance equation that should be used if the two samples are not the same size?

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
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ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
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Chapter9: Solving Quadratic Functions
Section: Chapter Questions
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When conducting a t-test for independent samples we have 2 ways of computing the variance. One way is to compute the variance for each sample, but this only works if the samples are the same size. If the samples are different sizes, we use a different equation. What is this variance equation that should be used if the two samples are not the same size? 

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