ci.mean1 {statpsych} | R Documentation |
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.
ci.mean1(alpha, m, sd, n)
alpha |
alpha level for 1-alpha confidence |
m |
estimated mean |
sd |
estimated standard deviation |
n |
sample size |
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
Snedecor GW, Cochran WG (1989). Statistical Methods, 8th edition. ISU University Pres, Ames, Iowa.
ci.mean1(.05, 24.5, 3.65, 40) # Should return: # Estimate SE LL UL # [1,] 24.5 0.5771157 23.33267 25.66733