#' 95 percent confidence interval for z distribution
#'
#' This function computes a 95 percent confidence interval for means based off the z-distribution
#' @keywords confidence_interval
#' @param x a list object
#' @export
#' @examples
#' conf.z()
conf.z = function(x){
n = length(x)
m = mean(x)
s = sd(x)
z.error = qnorm(0.975) * s / sqrt(n)
left = m - z.error
right = m + z.error
variable = c("left", "mean", "right")
value = c(left, m, right)
data.frame(variable, value)
}
#document()
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