Z Interval Calculator

Confidence interval of mean of a normal distribution σ known.

 

Example

Value	Keystroke	Display	Description
.95	C Level	0.9500	Stores the C Level value.
6	n	6.000	Stores the n value.
300	x̄	300.0	Stores the x̄ value.
3	σ	3.00	Stores the  σ value.
	Z Int	4.801	Calculates the Z 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	297.6	The lower limit
	ROLL	302.4	The upper limit

The History Detail

Z Interval
          302.4 : The upper limit.
          297.6 : The lower limit.
         0.9500 : The confidence level.
          6.000 : The sample size, n.
          300.0 : The sample mean, x̄.
          3.000 : The population standard deviation, σ.
          4.801 : The Confidence Interval for Mean with σ Known.

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

Reference:

Confidence Interval - Wikipedia