iscamonepropztest: One Proportion Z-Test and Interval

In ISCAM: Companion to the Book "Investigating Statistical Concepts, Applications, and Methods"

One Proportion Z-Test and Interval

Description

iscamonepropztest calculates a one-proportion z-test and/or a corresponding confidence interval.

Usage

iscamonepropztest(
  observed,
  n,
  hypothesized = NULL,
  alternative = "two.sided",
  conf.level = NULL,
  verbose = TRUE
)

Arguments

observed	The observed number of successes. If a value less than 1 is provided, it is assumed to be the sample proportion.
n	The sample size.
hypothesized	(optional) hypothesized probability of success under the null hypothesis.
alternative	(optional) character string specifying the form of the alternative hypothesis. Must be one of "less", "greater", or "two.sided".
conf.level	(optional) confidence level(s) for a two-sided confidence interval.
verbose	Logical, defaults to TRUE. Set to FALSE to suppress messages

Value

This function prints the results of the one-proportion z-test and/or the confidence interval. It also generates plots to visualize the test and interval.

Examples

iscamonepropztest(observed = 35, n = 50, hypothesized = 0.5)

iscamonepropztest(
  observed = 0.8,
  n = 100,
  hypothesized = 0.75,
  alternative = "greater",
  conf.level = 0.95
)

iscamonepropztest(observed = 60, n = 100, conf.level = 0.90)

ISCAM documentation built on Feb. 12, 2026, 5:07 p.m.