ci_onesample_t(A, cl)

Computes a confidence interval for the mean of sample A with unknown standard deviation and confidence level cl.
Assumes the population is normal or that the sample is large.

See also ci_onesample_pro ci_onesample_zreqsize ci_onesample_z 

Example

(See NOTE below)

a=( 447, 313, 217, 833, 649, 207, 844, 768, 277, 554, 627, 253, 1064, 805, 570, 430, 397, 26, 653, 223, 883, 214, 587, 549, 443 )

( 447 313 217 833 649 207 844 768 277 554 627 253 1064 805 570 430 397 26 653 223 883 214 587 549 443 )

ci_onesample_t(a, .95)

One-Sample T-Interval Test.

Confidence interval for the mean.

Confidence level : 0.95 (95%)

Results:

m : 513.32

s : 262.23092876318003

Interval  : (405.0763927398844, 621.5636072601158 )

Margin of error : 108.24360726011567

NOTE: The data used in this example was taken from the textbook Introductory Statistics 6th Ed. by Neil A. Weiss with kind permission of Addison Wesly Longman, Inc. (AWL). AWL does not endorse nor it supports the Calcugator.