Any mean square formula is an average of numbers of

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Unformatted text preview: pected by the null hypothesis, i.e. under the assumption that the true difference in the population is zero. In other words, it’s the standard deviation of the sampling distribution of MA – MB, which is the standard error of MA – MB. M " MB (5) t= A #M A " M B Equations 4 and 5 can be combined into a single formula for t. ! M A " MB (6) t= $1 & + 1' ) MS # n % A nB ( Degrees of freedom for independent ­samples t ­test. The degrees of freedom for a t statistic equals the degrees of freedom from the estimate of σ2 in its denominator. This estim...
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This document was uploaded on 02/25/2014 for the course PSYC 3101 at Colorado.

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