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Confidence Limits for Population Means

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To calculate confidence limits for population means

You can calculate a pooled variance as:

Confidence limits for population means

You can calculate this with:

where Xi is the mean of each population, ta(2),v is the t value for the confidence range,  with a(2) significance and v degrees of freedom.   The variance is the pooled variance from above and n is the number of samples taken.

Also See:

Zar, J. H. 1984. Biostatistical Analysis. Prentice-Hall, Inc. Englewood Cliffs, New Jersey. 718 pp.