inst/snippet/ci-99.R
zstar <- - qnorm(0.005); zstar
se <- 2 / sqrt(25); se
zstar * se
10 + c(-1,1) * zstar * se # confidence interval
zstar <- - qnorm(0.005); zstar
se <- 2 / sqrt(25); se
zstar * se
10 + c(-1,1) * zstar * se # confidence interval
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