StatTools : Sample Size for Estimating Population Standard Deviation : Tables

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Sample Size Table for Standard Deviation Percent Error Table for Standard Deviation

The cells contain the sample size necessary to obtain the column Confidence Interval to within the row error of the true standard deviation. For example, 84 subjects will be necessary to obtain a 80% confidence that the standard deviation obtained is within ±10% of the true value.

Error80%CI85%CI90%CI95%CI99%CI99.9%CI
±1%82131036313529192083317554140
±2%2054259233834803829513536
±5%33041656178114012167
±10%84105137193333543
±15%38476187149242
±20%2227354984137
±25%151823325488