T Interval Calculator

The Confidence Interval for Mean with σ Unknown, Normal Distribution..

 

Example

Value	Keystroke	Display	Description
.95	C Level	0.9500	Stores the C Level value.
4	n	4.000	Stores the n value.
1.75	x̄	1.750	Stores the x̄ value.
.129	s	0.129	Stores the  s value.
	T Int	0.4105	Calculates the T Interval

This calculator also calculates the upper and lower limits and enters them in the stack.
By returning these values to the stack you can use them for other calculations without having to write them down and re-enter them.

Value	Keystroke	Display	Description
	ROLL	1.545	The lower limit
	ROLL	1.955	The upper limit

The History Detail

T Interval
          1.955 : The upper limit.
          1.545 : The lower limit.
         0.9500 : The confidence level.
          4.000 : The sample size, n.
          1.750 : The sample mean, x̄.
         0.1290 : The sample standard deviation, s.
         0.4105 : The Confidence Interval for Mean with σ Unknown, Normal Distribution.
Result:	 0.4105

Note that you can enter a "T Int" value and solve for the C Level, n or σ.

Reference:

Confidence Interval - Wikipedia