HOW TO FIND TWO SAMPLE T CONFIDENCE INTERVALS USING DATA WITH TI83 CALCULATOR

Steps	Key Sequence	Screens
1. Enter data into list, L1
2. Enter data into list, L2
3. Set up Stats Tests	STAT
	twice
	0 (for 2–SampTInt...)
4. Select Data	use left arrow key (if necessary) to move cursor to Data, then ENTER
5. Select list, L1	(press ALPHA), then 2nd, then 1, then ENTER
6. Select list, L2	(press ALPHA), then 2nd, then 2, then ENTER
7. Input confidence level	twice, enter confidence level (AS DECIMAL), then ENTER
8. Enter no for Pooled	use left arrow key (if necessary) to move cursor to No, then ENTER
9. Calculate CI	once, ENTER
10. Scroll down to find more calculations	Press
In this case the 90% CI is 3.9676 to 9.1157.