Confidence Interval of Mean
for T-Test - One Small Sample


Press STAT and the right arrow twice to select TESTS. 


Use the down arrow to select 8:TInterval…



Press ENTER.

Use right arrow to select Stats

(summary values rather than raw data).

Enter mean, standard deviation, sample size, and confidence level.

Press down arrow to select Calculate and press ENTER.




The 95% confidence interval for the Student’s t Distribution is 5.2 to 8.4 when the mean is 6.8, the standard deviation is 1.0, and the sample size is 4.