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OCR: upper 95% Mean andlower 95% Mean are 95% confidence limits about the mean. They define an interval which very likel to contain the true population mean. 11 many random samples ar drawn from the same population and each 95% confidence inter determined, you expect 95% of the confidence intervals computed to contain the true population mean. The upper and Id limits are computed the sample mean, plus or minus 97 25% Student's t value multiplied by the standard error of the mean. Y+t SY Y-t sy standaro