confidence_norm
Half-width of a confidence interval (normal distribution).
Syntax
Section titled “Syntax”v = confidence_norm(alpha, standard_dev, size)Description
Section titled “Description”Returns norm_s_inv(1 - alpha/2) * standard_dev / sqrt(size) — the half-width of an (1 - alpha) * 100% confidence interval around the sample mean, using the normal distribution.
Examples
Section titled “Examples”% 95% CI half-width with sigma=10, n=50:confidence_norm(0.05, 10, 50) % ≈ 2.77See also
Section titled “See also”confidence_t— Half-width of a confidence interval (t distribution).norm_s_inv— Inverse standard-normal CDF.