ci.mean1: Confidence interval for a single mean

In statpsych: Statistical Methods for Psychologists

Confidence interval for a single mean

Description

Computes a confidence interval for a population mean using the estimated mean, estimated standard deviation, and sample size. Use the t.test function for raw data input.

Usage

ci.mean1(alpha, m, sd, n)

Arguments

alpha	alpha level for 1-alpha confidence
m	estimated mean
sd	estimated standard deviation
n	sample size

Value

Returns a 1-row matrix. The columns are:

• Estimate - estimated mean

• SE - standard error

• LL - lower limit of the confidence interval

• UL - upper limit of the confidence interval

References

\insertRef

Snedecor1980statpsych

Examples

ci.mean1(.05, 24.5, 3.65, 40)

# Should return:
#        Estimate        SE       LL       UL
# [1,]       24.5 0.5771157 23.33267 25.66733
 

statpsych documentation built on July 9, 2023, 6:50 p.m.