size.ci.mean: Sample size for a mean confidence interval

In statpsych: Statistical Methods for Psychologists

Sample size for a mean confidence interval

Description

Computes the sample size required to estimate a population mean with desired confidence interval precision. Set the variance planning value to the largest value within a plausible range for a conservatively large sample size.

For more details, see Section 1.28 of Bonett (2021, Volume 1)

Usage

size.ci.mean(alpha, var, w)

Arguments

alpha	alpha level for 1-alpha confidence
var	planning value of response variable variance
w	desired confidence interval width

Value

Returns the required sample size

References

\insertRef

Bonett2021statpsych

Examples

size.ci.mean(.05, 6.0, 1.5)

# Should return:
# Sample size
#          43
 

statpsych documentation built on Jan. 13, 2026, 1:07 a.m.