Casio FX-9860G n :, x :, n n, Left, Right, n n 1– n, u 1-Prop Z Interval

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Confidence Interval

u 1-Prop Z Interval

1-PropZ Interval uses the number of data to calculate the confidence interval for an unknown proportion of successes.

The following is the confidence interval. α is the level of significance. The value 100 (1 – α) % is the confidence level.

	x			α	1 x	x	n :	size of sample
Left =	n	– Z		2	n n 1– n		x :	data
		x		α	1 x		x
Right =		n	+ Z	2	n n	1– n

Perform the following key operations from the statistical data list.

4(INTR)

1(Z)

3(1-P)

Data is specified using parameter specification. The following shows the meaning of each item.

C-Level .........................	confidence level (0 < C-Level < 1)
x ..................................	data (0 or positive integer)
n ..................................	size of sample (positive integer)
Save Res .....................	list for storage of calculation results (None or List 1 to 26)
Execute ........................	executes a calculation

After setting all the parameters, use c to move the highlighting to “Execute” and then press the function key shown below to perform the calculation.

• 1(CALC) ... Performs the calculation.

Calculation Result Output Example

Left ...............................	confidence interval lower limit (left edge)
Right.............................	confidence interval upper limit (right edge)
pˆ ..................................	estimated sample proportion
n ..................................	size of sample

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